Saddam had a long history of supporting terrorism. Just because he wasn't the biggest threat, it doesn't mean we should have therefore ignored him.
The world community had played patty-cake with Saddam for 12 years. We finally ended that game, and showed that we will no longer accept UN games and words as a substitute for action against rogue states. And other rogue nations are now on notice as a result.
Now that's a laugh. You can be certain of one thing -- the next time the U.S. ever feels a need to deal with a "rogue nation" using military force, Step #1 in the process will be an attempt to secure U.N. approval.