Why do we "need" to get rid of Saddam? What business is it of ours? We are the ones meddling in his part of the world, not vice-versa. There's no doubt he's a bad guy, a brutal dictator. But it's just not our place to be effecting "regime changes" in foreign countries, even if we don't like the current regimes.
So based on this logic I can safely assume that you felt it was a mistake to force regime change in Nazi Germany? So you feel that although Hitler was bad, he should have been left alone by the U.S. and Britain, even though he attacked first? Wow, I'm amazed. I know you didn't say that word for word, but that's the same logic you just used.