Nonsense. God is neither cruel or wicked. Instead He is perfect love and kindness. What your statement shows is truly a lack of understanding of the depths of the depravity and wickedness of man.
Our Lord Jesus Christ is the exact same God of the Old Testament as He is of the New. It is He that rain fire on Sodom and brought the plagues on Egypt. And He was right to do so. It is justice and God trying to get our attention and we are better off for it, still talking about it all these centuries later. This statement is silly and simply shows a lack of understanding on the wickedness of man, a refusal to acknowledge our sinful state, and an inability to reconcile what God has revealed about Himself in ALL of the scriptures. People have far more regards for themselves then they should and in doing so they simply lower the glory of God.
Our Lord Jesus had no problem in saying what He would do in the last days, comparing the final destruction of man to the days of Noah or Sodom (some of the worst destruction)-and neither did Peter:
2Pe 2:6 if by turning the cities of Sodom and Gomorrah to ashes he condemned them to extinction, making them an example of what is going to happen to the ungodly;
2Pe 2:7 and if he rescued righteous Lot, greatly distressed by the sensual conduct of the wicked
2Pe 2:8 (for as that righteous man lived among them day after day, he was tormenting his righteous soul over their lawless deeds that he saw and heard);
2Pe 2:9 then the Lord knows how to rescue the godly from trials, and to keep the unrighteous under punishment until the day of judgment,
2Pe 2:10 and especially those who indulge in the lust of defiling passion and despise authority. Bold and willful, they do not tremble as they blaspheme the glorious ones,
2Pe 2:11 whereas angels, though greater in might and power, do not pronounce a blasphemous judgment against them before the Lord.
2Pe 2:12 But these, like irrational animals, creatures of instinct, born to be caught and destroyed, blaspheming about matters of which they are ignorant, will also be destroyed in their destruction,
I believe your initial point was laying the wickedness of Hitler and Stalin on God - not man. Which is it? I think your argument tries to have it both ways.