Iraq needed a facelift anyway.
For a dictator to mass murder the public makes him no worse than what Hitler did to the Jews.
And then you're saying that it is not worth the risk of attacking Iraq to prevent the the future deaths of millions of innocent people just because they haven't attacked us?
Just because they have no wmd or any solid links to Al Quada doesn't mean that they are on our side.
In terms of fighting terrorism and avenging 9/11, how far do you want your vendetta to go?