Didn't the Jews flee when the Temple was destroyed around 70AD?
They did flee out of Jerusalem because they saw Jerusalem surrounded by armies. That prophecy was fulfilled in 70AD, yes.
There is still the future prophecy to flee into the mountains when the abomination of desolation is standing where
it (not he) should not be, in the holy place, as spoken of by Daniel the prophet. Which when we go to Daniel 12, the abomination of desolation is time of the end when transportation and knowledge are increased - greatly, is what I think is being implied - our generation.
Which our generation has the weaponry to destroy all life on earth, which man did not have the capability back in 70 AD. So the Matthew 24:15-16 , Matthew 24:22, prophecy about fleeing and the abomination of desolation is still ahead of us - but not too far away.
It is really important to note the difference between the transgression of desolation - by which the daily sacrifice is stopped, and the abomination of desolation, which also the daily sacrifice continues to not be done.
first, the transgression of desolation - the person goes into the temple sits.
followed by the abomination of desolation - an image, a statue in the standing position, of the beast.
A person can see what is going to happen by mentally linking some critical passages together.
The person breaks violates the covenant (Mt. Sinai) in the middle of the week. First, by transgressing the covenant, and stopping the daily sacrifice.
Why? Because in Daniel 8, it says
he shall magnify himself in his heart ... 25. And through his policy also he shall cause craft to prosper in his hand; and
he shall magnify himself in his heart, and by peace shall destroy many: he shall also stand up against the Prince of princes; but he shall be broken without hand.
So, the person thinks he has achieved God-hood. And goes in the temple and
sits . "Sits" is very important. For one thing
"sits" distinguishes the transgression of desolation act from the abomination of desolation,
"standing" in the holy place.
And "sits" links to Ezekiel 28:1-10, God's reaction to the revealed man of sins's audacious act. See? He has magnified himself in his heart. He is claiming to be God. He "sits" in the seat of God, that is, in the temple. In the midst of the seas, metaphoric language that he is showing the entire world that he is God.
2 Son of man, say unto the prince of Tyrus, Thus saith the Lord GOD;
Because thine heart is lifted up, and thou hast said, I
am a God,
I sit in the seat of God, in the midst of the seas; yet thou
art a man, and not God, though thou set thine heart as the heart of God:
God
mocks him for thinking he is so smart -
"Behold, thou art wiser than Daniel". Back in Daniel 8, he understands dark sentences, riddles, and has success but not by his power. He will be tapped into the occult - kabbalah, Jewish mysticism, as he will be a Jew.
3 Behold,
thou art wiser than Daniel; there is no secret that they can hide from thee:
God has the person killed for his audacious act of sitting in the temple...
6 Therefore thus saith the Lord GOD; Because thou hast set thine heart as the heart of God;
7 Behold, therefore I will bring strangers upon thee, the terrible of the nations: and they shall draw their swords against the beauty of thy wisdom, and they shall defile thy brightness.
8 They shall bring thee down to the pit, and thou shalt die the deaths of
them that are slain in the midst of the seas.
9 Wilt thou yet say before him that slayeth thee, I am God? but thou shalt be a man, and no God, in the hand of him that slayeth thee.
So he will be killed (the mortally wounded head, king, in Revelation 13:1-3) and brought down to the pit, hell. Which is in Isaiah 14.
Again he is mocked by them there, before God brings him back to life in Isaiah 14:18 because he destroys his land and his people - again because of God's great disdain for him because his ego and pride and involvement in the occult - all parts of the equation of him becoming the Antichrist, then later revealed as the man of sin, then after that becoming the beast of Revelation.