You don't have a crystal ball either. That little kid playing his PSP next to you on the bus might grow up and become a mass murderer. Are you going to shoot him? I'd love to see that defense come up in court.
Saddam's Iraq would never pose a legitimate threat to the USA and you know it. Geography, finance, demographics and Iraq's lack of infrastructure make that abundantly clear to anyone who isn't playing the role of apologist for the war.
The really stupid part about the argument you posted above is that Saddam was just about the only non-Islamic ruler in the area. Hell, he used to be a US ally - or has that been conveniently forgotten? Oh yes, those human rights abuses were just fine when Saddam was playing ball. But then he... ummm... he did that thing... you know, the thing that made the US mad... ummm... sorry, what was it again that provoked the 2003 invasion, again? It wasn't human rights - Rumsfeld shook the man's hand, fercrissakes!
It's immoral to destroy an entire country's infrastructure, plunge it into civil war and kill (directly or indirectly) hundreds of thousands of people to kill one man, yes. What the hell gives any nation the right to make that kind of call?
You've yet to address me with an argument that contained any kind of logic. You have put up a lot of "what ifs" which aren't really a good justification for killing innocent people.
Air strikes have a nasty way of killing innocent people. So does destroying the infrastructure that provides clean water, electricity and medical services. So does starting a war on someone else's soil for no good reason. Quit playing dumb. America has killed far more Iraqis since the 1991 than anyone else. Arguing otherwise is the equivalent of shouting fire in the theatre, and then claiming that the people trampled to death at the exits are someone else's responsibility.