First off, I don't think from the evidence I've seen, that Saddam had involvement in the 9/11 events. He did, however, play a major role in other terror attacks - as I've shown.
Again, you're trying to excuse Saddam from reprisal because others may be worse. I believe in freeing Iraq and removing Saddam, America has set the catalyst for change in this region, and warned other terror-inclined nations and groups that the American military's metaphoric arm is far-reaching, powerful and swift. Syria, for example, has taken note of America's involvement in Iraq and is now, not surprisingly, beginning to tow the line for fear of being next.