It's not geopolitics to try and determine if fewer people would die with or without Saddam in power. Saddam's chemical attacks against civilians are well documented and not widely disputed. His internal security apparatus was open with their brutality in order to induce fear on the population.
I think that the 2nd Iraq War was a mistake, particularly how the government misled the people, but I find it absolutely baffling when people will not even honestly address the situation in good faith. You cannot simply argue that "many people civilians died as a result of the Iraq War therefore it's bad" without addressing the situation beforehand. Lots of people died during the Allied invasion of Germany, but I think most people would agree that it was the correct thing to do.