Writing for The Nation, Joshua Holland reports on the motivations of ISIS bombers. Religion is certainly part of it. But most of the rationale for killing, often via suicide, is a reaction to actual and perceived oppression. He writes:

ISIS emerged from the insurgency against the US occupation of Iraq just as the Al Qaeda network traces its origins to the Afghan resistance to the Soviet occupation in the 1980s.

If you believe in causal chains, then we have to point the finger at G.W. Bush and his merry band of neocons, most notably Dick Cheney, for creating the conditions that led to ISIS.

As Sir Isaac used to say, for every action there is an equal, opposite reaction. We can call it “blowback.”