If you cannot morally support a war against Saddam, who can you support one against? How many of his own citizens does a dictator needs to kill before you believe its ok to move in. You must have a number in mind, since Rwandan deaths are more important than Iraqi ones.
Iraq simply provides more opportunities for progress in the ME, than does Rwanda progressing the continent of Africa. We already had bases staged in the area from the first gulf war. Logistically, Iraq made a ton of sense as far as staging for the war as well as geo-political influence. Besides, there are plenty of European countries sitting around not doing anything of value with regards to human rights outside their own borders. Where is your ire for their non-activity in Rwanda, Darfur, Myannmar, etc.... Or are your criticisms only for whenever the US acts, or doesn't?
At least we do something, which is more than the rest of the piggybackers can claim.