We didn't go to Iraq for oil, we went there so that more of our own money could be funneled from government coffers into politicians' bank accounts by way of defense contracts.
We're terrified of the fact that we live in an arational, incomprehensible world. It's a comforting fiction that some large conspiracy controls everything for the benefit of itself at the expense of everyone else, because at least that admits the possibility of control. And if societies can be controlled, at least in principle they can be fixed.
Much scarier is the idea that power stumbles blindly around like a drunken three legged elephant, arbitrarily murdering half a million people for no coherent reason beyond, well, why not?