Sorry, but I think you are grasping hereI don't think Wes is ever just a simple asshole though. He shot some guy in the kneecaps to show everyone that they had to work on Fred's case, that nothing else mattered. In that way, he had a goal.
Let me say this: Wes, Lilah and Faith save series 4 from being completely unwatchable. The scenes with Wes and Illyra are also fantastic.