Because unending torture cannot be the will of a God of peace, love and joy. It defies His very nature.
You're only really familiar with one side of His nature. There is the goodness and severity of God. In one place it says His name is jealous. In countless places it speaks of very harsh judgment.
We are created in the image and likeness of God and are eternal.
There are many "witnesses" in the Word of God that speak of eternal or everlasting punishment. Some use the same word in the OT that describes God's eternal nature.
The eternal God is thy refuge, and underneath are the everlasting arms: and he shall thrust out the enemy from before thee; and shall say, Destroy them.
Deut 33:27
Blessed be the Lord God of Israel
from everlasting, and to everlasting. Amen, and Amen.
Psalms 41:13
Thy throne is established of old:
thou art from everlasting.
Psalms 93:2
And at that time shall Michael stand up, the great prince which standeth for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book. And many of them that sleep in the dust of the earth shall awake,
some to everlasting life, and some to shame and everlasting contempt. And they that be wise shall shine as the brightness of the firmament; and they that turn many to righteousness as the stars
for ever and ever.
Dan 12:1-3
But thou, Bethlehem Ephratah, though thou be little among the thousands of Judah, yet out of thee shall he come forth unto me that is to be ruler in Israel;
whose goings forth have been from of old, from everlasting.
Micah 5:2
Woe unto the world because of offences! for it must needs be that offences come; but woe to that man by whom the offence cometh! Wherefore if thy hand or thy foot offend thee, cut them off, and cast them from thee: it is better for thee to enter into life halt or maimed,
rather than having two hands or two feet to be cast into everlasting fire. And if thine eye offend thee, pluck it out, and cast it from thee: it is better for thee to enter into life with one eye, rather than having two eyes to be cast into hell fire.
Matt 18:7-9
And every one that hath forsaken houses, or brethren, or sisters, or father, or mother, or wife, or children, or lands, for my name's sake, shall receive an hundredfold,
and shall inherit everlasting life. But many that are first shall be last; and the last shall be first.
Matt 19:29-30
And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me. Then shall he say also unto them on the left hand,
Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
Matt 25:40-41
Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
And these shall go away into everlasting punishment: but the righteous into life eternal.
Matt 25:45-46
And I say unto you, Make to yourselves friends of the mammon of unrighteousness; that, when ye fail,
they may receive you into everlasting habitations.
Luke 16:9
And he said unto them, Verily I say unto you, There is no man that hath left house, or parents, or brethren, or wife, or children, for the kingdom of God's sake, Who shall not receive manifold more in this present time, and
in the world to come life everlasting.
Luke 18:29-30
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish,
but have everlasting life.
John 3:16
But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water
springing up into everlasting life.
John 4:14
Labour not for the meat which perisheth,
but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed.
John 6:27
And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day. And this is the will of him that sent me, that every one which seeth the Son, and believeth on him,
may have everlasting life: and I will raise him up at the last day.
John 6:39-40
Verily, verily, I say unto you, He that believeth on me hath everlasting life. I am that bread of life. Your fathers did eat manna in the wilderness, and are dead. This is the bread which cometh down from heaven, that a man may eat thereof, and not die. I am the living bread which came down from heaven: if any man eat of this bread,
he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.
John 6:47-51
And I know that his commandment is life everlasting: whatsoever I speak therefore, even as the Father said unto me, so I speak.
John 12:50
Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and
judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.
Acts 13:46
But now being made free from sin, and become servants to God, ye have your fruit unto holiness,
and the end everlasting life. For the wages of sin is death; but the gift of God is
eternal life through Jesus Christ our Lord.
Romans 6:22-23
But now is made manifest, and by the scriptures of the prophets, according to
the commandment of the everlasting God, made known to all nations for the obedience of faith: To God only wise,
be glory through Jesus Christ for ever. Amen.
Romans 16:26-27
Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. For he that soweth to his flesh shall of the flesh reap corruption; but
he that soweth to the Spirit shall of the Spirit reap life everlasting.
Gal 6:7-8
Seeing it is a righteous thing with God to recompense tribulation to them that trouble you; And to you who are troubled rest with us, when the Lord Jesus shall be revealed from heaven with his mighty angels, In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ:
Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power; When he shall come to be glorified in his saints, and to be admired in all them that believe (because our testimony among you was believed) in that day.
2 Thess 1:6-10
Now our Lord Jesus Christ himself, and God, even our Father, which hath loved us, and
hath given us everlasting consolation and good hope through grace, Comfort your hearts, and stablish you in every good word and work.
2 Thess 2:16-17
Howbeit for this cause I obtained mercy, that in me first Jesus Christ might shew forth all longsuffering,
for a pattern to them which should hereafter believe on him to life everlasting. Now unto the King
eternal, immortal, invisible, the only wise God, be honour and glory
for ever and ever. Amen.
1 Tim 1:16-17
Who only hath immortality, dwelling in the light which no man can approach unto; whom no man hath seen, nor can see:
to whom be honour and power everlasting. Amen.
1 Tim 6:16
Now the God of peace, that brought again from the dead our Lord Jesus, that great shepherd of the sheep,
through the blood of the everlasting covenant, Make you perfect in every good work to do his will, working in you that which is wellpleasing in his sight, through Jesus Christ; to whom be glory for ever and ever. Amen.
Heb 13:20-21
Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall: For so an entrance shall be ministered unto you abundantly
into the everlasting kingdom of our Lord and Saviour Jesus Christ.
2 Peter 1:10-11
And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh,
are set forth for an example, suffering the vengeance of eternal fire.
Jude 1:6-7
And I saw another angel fly in the midst of heaven, having
the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,
Rev 14:6
And if thy hand offend thee, cut it off: it is better for thee to enter into life maimed,
than having two hands to go into hell, into the fire that never shall be quenched: Where their worm dieth not, and the fire is not quenched. And if thy foot offend thee, cut it off: it is better for thee to enter halt into life, than having two feet to be cast into hell, into the fire that never shall be quenched: Where their worm dieth not, and the fire is not quenched. And if thine eye offend thee, pluck it out: it is better for thee to enter into the kingdom of God with one eye, than having two eyes to be cast into hell fire: Where their worm dieth not, and the fire is not quenched.
Mark 9:43-48
He answered and said unto them, He that soweth the good seed is the Son of man; 38 is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one; 39 that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels. 40 As therefore the tares are gathered and burned in the fire; so shall it be in the end of this world. 41 The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity; 42
And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth. 43 Then shall the righteous shine forth as the sun in the kingdom of their Father. Who hath ears to hear, let him hear.
Matt 13:37-43 (KJV)
Again, the kingdom of heaven is like unto a net, that was cast into the sea, and gathered of every kind: Which, when it was full, they drew to shore, and sat down, and gathered the good into vessels, but cast the bad away. So shall it be at the end of the world: the angels shall come forth, and sever the wicked from among the just, 50
And shall cast them into the furnace of fire: there shall be wailing and gnashing of teeth.
Matt 13:47-50
And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them. 10 And the devil that deceived them was cast into the lake of fire and brimstone,
where the beast and the false prophet are, and shall be tormented day and night for ever and ever. 11 And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them. 12 And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works. 13 And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works. 14 And death and hell were cast into the lake of fire. This is the second death. 15 And whosoever was not found written in the book of life was cast into the lake of fire.
Rev 20:9-15
will be “raised” (already aware and suffering) 
