It also took 20% of the world's oil production offline for nearly a decade, which profits other oil companies, especially with the guaranteed market for military fuel. And there was a _hope_, ill-founded, that a wave of strong anti-Muslim-leadership politics would sweep the region.
Yeah, but that hope was not based in the History of the mideast and reality as it exists there. That was just another inconvenient bit of wishful thinking that was useful in settling that particular family feud. It's a place where one can go from esteemed ally to the "American Devil" overnight, depending on the convenience of the parties involved.
So we were surprised that after we sort of installed a democracy, they all went back to what they were doing before, which is enjoying the hell out of killing each other.