We don’t have even need to imagine what would have happened if the Nazis had won
As in, they would have forgiven themselves and punished international courts who tried to prosecute them.
On the other hand America justified using 2 nukes on people
No surviving Soviet Union and hence no Mao, no North Korea (and no Korean War), Viet Minh easily squashed, no Vietnam War (the American one -- but the one against the French would happen anyway). Half of Europe would not have been occupied by the Soviet Union.
And the Nazis wouldn't have lasted long, anyway.
I have a hard time seeing the alternative history where the nazis' won which lead to the formation of Israel 3 years later and consequent Israeli colony expansion, leading to the current conflicts and ICC stuff.
but it would probably an an entertaining novel.