Its called "political pressure" ... and votes. Don't forget that before 9/11, Bush was in deep shit... Now, everything is second to the "evildoer", the weapons of mass destruction, etc.... What about Korea? Sadam is a dictator? Sure, but what about Pinochet's executions in Chile???
Not only did the US not "invade", they put him there, with the Somoza ( Nicaragua), Noriega ( till he decided to cut the US off the dope deals...) Iran Shah , Marcos ( what a sweetheart).

VBasically, it comes down to: you are of of us or you are out...

PS: Sadam was supported by the US, and equipped militarilly to fight Iran. All those weapons and Anthrax came from the US GOV ( CIA). Oussama Bin Laden was the US man in Afghanistan to fight againt the mean URSS that invaded Afghanistan. He was also financed , armed, and had " US political advisers" ....

So it demands from where the wind blows, but one thing for sure it blows up Georgie's ass ....