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.
True but the actions of the past presidents have paved the way and emboldened the neoconservative approach that got us bogged down in Iraq. I'm really sorry for all the people on both sides that died and hope that God punishes those that were responsible for the bulk of the deterioration over there. I didn't vote for Bush either time nor his democratic opponent but now I'm actively taking steps to do my part to restore the GOP to a party of non-intervention, free markets and sound money. Thankfully, Rand Paul is off to a great start and the party and the public is trending his way on a host of issues.