Saddam got what he deserved, but the people of Iraq didn't deserved what came to them -- about half a million deaths[1] and later the rise of ISIS. Total number of people dead in the aftermath of American invasion is now bigger than the number of Saddams victims.
Do you know that the US supported Saddam in his war of agression against Iran? [0] Saddam could've been hanged much earlier and countless lives could've been saved if not for American support of scumbag and dictator.
As for WW2, please read about the Munich agreement.[2]