Let me try to put it simpler -- despite the broad strokes painted by right wingers that anyone who opposes Bush is a peacenick hippie communist, there are TONS of people who were in favor of the Afghanistan war in late 2001 but OPPOSED to Iraq.
Just answer me the question: why do you think that is?
Because I've talked to these people every day, and I consider myself one of them. Yes, there are some people who opposed both wars (bitonti on this message board, for one) and opposed Clinton's wars in Bosnia because they live in a world where war can NEVER be the answer. But that is not the M.O. of the majority of Democratic Party politicians and mainstream liberals.
So I disagree with your generalizations that people on the left are just afraid to get their hands dirty and would oppose anything Bush did because they think he's a nazi. Gore would have invaded Afghanistan, hell NADER might have done it too. It was a direct response to a pathetic regime that basically thumbed its nose at us and said they would harbor the man responsible for 9/11.
So why do you think some people who opposed Iraq did not oppose Afghanistan? Could it possibly be, they have legitimate questions about the motivations and character of the people in office and how it relates back to 9/11 and terrorism? Or do you really think it comes down to brainwashing by liberals and their media?