Without Dubya, we wouldn’t have Trump, Putin and possibly Xi. After Clinton the US had a very high prestige in the world and even their antagonists were more likely than not to try and not piss them off too much. After the Iraq invasion the US lost all claim to being not just another imperialistic power and this definitely emboldened the others. Any idea that rules and international law mattered went out of the window. Add to that the normalization of torture, unrestricted mass surveillance and open disregard for democracy and we have a lot of the ingredients for the mess we’re in right now. And let’s not forget the 2008 financial meltdown which contributed to the feeling of disenfranchisement that drives a lot of the present day political divisions. So in my view Dubya really fucked shit up and we’re all still paying the price.