However, if you can produce the proof that Bush, et al were actively targeting civilians for the hell of it, then I'd agree that under those circumstances you'd have a point.
Define "for the Hell of it". Saddam definetly didn't gas those Kurds just for fun. He did it because they had this idea that they should revolt and take their homeland back.
And yes, Bush&Co. have
deliberately killed civilians. They've bombed a Pakistani village full of civilians to kill a single Al-Q'aida leader. They've released White Phosphorous, an illegal weapon, over Fallujah. They have targetted civilians "just for the Hell of it" several times already.