It was actually the Dick Cheney policy in 1991 (when he was Secy of Defense) which created the Taliban by abandoning Afghanistan and the people there who we had helped fight the Russians. Once the Russians were gone, we fled the country as fast as we could, abandoning the people to the warlords and finally the Taliban. This seems to have been his philosophy of Iran as well. Kill as many as possible without any clue as to what to do next.
I'm sure the CIA had quite a role in it as well, support for people who can't really do America any good is not one of their strong points.
God the Conservatives are surely the very worst Americans on the face of the earth. Evil, evil people with no conscience, no compassion, nothing but the fierce torture-loving, minority-hating bigots they would like us to believe they're not. Look at any tea party and see how they've fooled and enraged the lumpen, forsaken fools who believe them.