Had Saddam complied with the cease-fire terms, and the UN resolutions, there would have been no reason to invade Iraq.

Those "anti-war" folks who insisted that the US NOT act against the violations, BUT DID NOT DEMAND that Saddam comply are a major contributing cause of the invasion- they gave Saddam reason to think that he did not need to comply. It does not matter WHY people act, but what the CONSEQUENCES of their actions are.

I have in the past stated that the invasion was poorly planned and the post-combat phase was a foul-up- BUT the reason to go in was valid, and IMO required.