I can gas Jews because Hitler did? What Saddam did isn't relevant to what the US did. Saddam's torturing doesn't make what the US did at Abu ghraib and Guantanamo Bay less. You killed 8,000 Iraqi civilians in the initial attack. Women and children. How is Bush and his supporters any different from Osama bin Laden and his supporters?
Stop with the sectarian violence nonsense. 73% of all attacks were aimed at military targets.
Yes, we knew there was bad blood between Shiias and Sunnis in Iraq, being that the latter were oppressed by the former. We just didn't give a damn.
ISIS is nothing. A bunch of poorly armed, poorly trained combatants that are only effective where there's no functioning government. They can only exist in a power void, in this case created by the US. Iraq under Saddan, Syria, Turkey and Iran would have had no problem getting rid of them. Lets not forget that the US let ISIS wreck havoc in Syria in order to get rid of Assad. By US estimates, ISIS may be bad, but Assad is worse. Assad did more than anyone to help the Iraqi people, while the West did nothing. Assad had an open border policy against Iraq, letting refugees seek refuge. 1.2 m of them.