I would say one President really. George W Bush, and his administration lying to get us into Iraq. If not like you said OP, Saddam still has blood in his hand, but he would still be in power.
He is not in power, but what system the Iraqis have now? is it any better?
Yes, this is true. Iraq left itself susceptible to outside manipulation and the US capitalized on that. Clearly the US did not do it for Iraq in some altruistic manner. The US was fighting a idealistic war with USSR (or so we are told). Iraq choose to side with the US.
The war with the USSR had also been of financial interest, at least the war with cuba has been of financial interest.
Of course, the people at the time were feeling somewhat threatened... as opposed to say Iraq.