The reason why Hussein hasn't killed millions so far isn't because he hasn't had the inclination, its because he hasn't had the opportunity. He already tried his hand at genocide by gassing the Kurds. Now should we wait until he kills millions before we finally come to the conclusion that he could very well be the next Hitler? Your logic is flawed to say the least...
Hussein attempted to kill his own son, gets sexual pleasure from torturing prisoners (according to his former mistresses), his heads of state retire and then "vanish", his own people took over the southern portion of Iraq after the Gulf war only to be crushed and then systematically murdered, he a flagrantly ignored U.N. resolutions on inspections for over 7 years and oh yeah, there's the whole genocide thing I mentioned earlier.
But no, you're right, there's no way he could be the next Hitler...
Here's a little history lesson for you: After WWI the world forces decreed that Germany could not have a standing Army of over 80,000 troops. Once Hitler was voted Chancellor he began forming the SS, which was technically a "political" group even though they trained as soldiers. There numbers were over 1 million strong. The world knew about the SS, knew that they were really an army, but sat around and hoped nothing would come of it. Look what happened there. World apathy allowed millions to be killed. Maybe we should start taking out lessons from history, instead of constantly being forced to relive it.
I recommend all those who don't believe we should go to war should get their heads out of the sand or whatever other dark holes they have them stuck into.
As for thousands of Americans being killed in the war with Iraq, did you even pay attention to the first Gulf war?