War crimes are only committed by losers.
Did the Allies commit war crimes during the Second World War? Yes.
Were they as bad as war crimes committed by the Axis powers? Mostly not.
Was any serious attempt made in the post-war trials to account for crimes against humanity committed by both sides? Nope.
War crimes are only committed by countries without the wealth or military might to accuse their enemies of participating in crimes against humanity.
So when lefties are unmoved while liberal humanitarians celebrate war crimes charges brought to the Hague against a tinpot warlord in the third world, this is why.