I've seen very good points from both camps concerning the war. There are a lot of people who fully support this war and also many people who totally oppose it.
Perhaps we should look at it in a totally different perspective. Not much unlike the cells in our body, each of us are cells within a larger "collective society" which forms social norms and expectations. Also, not much unlike the cells in our body, none of us know the full ramifications of the situation. The president doesn't, Saddam Hussein doesn't and neither does any other "single person" within the collective.
Now, obviously a heart cell is alive and performs a function that is vital to the entire whole that we call a person. However, the cell cannot understand or realize the greater whole to which it is contributing. Likewise, no one person can understand the situational dynamics that have led up to this war.
So, putting aside our little egos, let's just assume we're all a slave to a much larger operating entity. What we then have is something playing out between two much larger systems that is incomprehensible to any one cell or person (continuing with the analogy).
Now I know this seems really far fetched (and I'm not high right now), but given the fact that no one person who contributes to a larger system can know all parts of that system, perhaps the issue of the legality of this war with respect to the United States is entirely a mute point, since the United States of America is operating under an independent "global consciousness" that is simply using a self-defense reaction from 9/11. Perhaps the 9/11 event set things into motion that are much larger than anyone can truly perceive. If you touch a hot stove, you'll pull away quickly and scream and cuss. But larger systems take much longer to react, adapt and transform.
So in essence, perhaps the United States is merely reacting to a serious incident that occurred over a year and half ago, but since the size and scope is much larger on this level, the entire reverberations of conflict between two larger states will take much longer to play out.
Since the United States of America is still in the primal stages of a self-defense reflex, I doubt that any amount of diplomacy is going to stop the events that have already been set into motion.
America feels highly vulnerable and, based on the components that make up the American society (American people), this entire country, if viewed as a macro-psuedosocial organism, is in a highly anxious state of existence right now.