Is it not possible that God punishment of his people was actually an act of love?
Revelation 3
19Those whom I love I rebuke and discipline. So be earnest, and repent.
Proverbs 13:24(AMP): "He who spares his rod (of discipline) hates his son, but he who loves him diligently disciplines and punishes him early."
Just because you love someone does not mean that you let them go on in their sinful ways without telling them or trying to change them and so it is unloving not to tell others of their major shortcomings rather than being unloving to tell others of their sins/failures although it should be done in a loving way.
Proverbs 13v1
A wise son heeds his father's instruction, but a mocker does not listen to
rebuke.
Proverbs 1
7 The fear of the Lord is the beginning of knowledge,
but fools despise wisdom and discipline.
8 Listen, my son, to your father's instruction
and do not forsake your mother's teaching.
9 They will be a garland to grace your head
and a chain to adorn your neck.
10 My son, if sinners entice you,
do not give in to them.
20 Wisdom calls aloud in the street,
she raises her voice in the public squares;
21 at the head of the noisy streets [
3] she cries out,
in the gateways of the city she makes her speech:
22 "How long will you simple ones [
4] love your simple ways?
How long will mockers delight in mockery
and fools hate knowledge?
23 If you had responded to my rebuke,
I would have poured out my heart to you
and made my thoughts known to you.
24 But since you rejected me when I called
and no one gave heed when I stretched out my hand,
25 since you ignored all my advice
and would not accept my rebuke,
26 I in turn will laugh at your disaster;
I will mock when calamity overtakes you-
27 when calamity overtakes you like a storm,
when disaster sweeps over you like a whirlwind,
when distress and trouble overwhelm you.
28 "Then they will call to me but I will not answer;
they will look for me but will not find me.
29 Since they hated knowledge
and did not choose to fear the LORD ,
30 since they would not accept my advice
and spurned my rebuke,
31 they will eat the fruit of their ways
and be filled with the fruit of their schemes.
32 For the waywardness of the simple will kill them,
and the complacency of fools will destroy them;
33 but whoever listens to me will live in safety
and be at ease, without fear of harm."
Psalm 119
21 You rebuke the arrogant, who are cursed
and who stray from your commands.
Proverbs 15
30 A cheerful look brings joy to the heart,
and good news gives health to the bones.
31 He who listens to a life-giving rebuke
will be at home among the wise.
32 He who ignores discipline despises himself,
but whoever heeds correction gains understanding.
Proverbs 28
23 He who rebukes a man will in the end gain more favor
than he who has a flattering tongue.
Ecclesiastes 7
5 It is better to heed a wise man's rebuke
than to listen to the song of fools.
Titus 1
12Even one of their own prophets has said, "Cretans are always liars, evil brutes, lazy gluttons." 13This testimony is true.
Therefore, rebuke them sharply, so that they will be sound in the faith 14and will pay no attention to Jewish myths or to the commands of those who reject the truth.
Titus 2
14who gave himself for us to redeem us from all wickedness and to purify for himself a people that are his very own, eager to do what is good.
15These, then, are the things you should teach.
Encourage and rebuke with all authority. Do not let anyone despise you.
God loves everyone and yet he still rebukes those who are wrong and i don't necessarily think a christian is being unloving if they rebuke someone who is clearly wrong although it is possible. Also it is wise that we should listen to other when they rebuke us as it can often teach us and help us to grow. The bible only says to listen to the rebukes of the wise as they can teach us but not to listen to the rebukes of fools as some rebukes may be unjustified. There will also be those who reject rebuke and if they reject your rebuke then do not waste time trying to rebuke them even more but remember rebukes ahould be done in a loving way and are reserved for the wiser and more mature christians and you should never rebuke someone unless you are 100% sure they are wrong. Tolerance is not a biblical virtue and we are never told to be tolerant but we are told to be loving and we need to find a balance between rebuking those who are wrong and loving them at the same time without going to either extreme.
The fact is that gods punishments claim to be for the good of the people who were punished eg is it not possible that the destruction of hitlers nazi regime or the fall of communism or the american invasion of iraq was good for the world? in the same way it is possible that gods destruction of certain evil peoples was actually the best thing for society and was the most loving thing that he could do.