Why do certain liberals believe we entered Iraq for oil?

It's very convenient to attempt to pin that badge on Bush, since he came from an oil background. An attempt to sully his personal honor. The liberals ignore the times Saddam threw out the U.N. inspectors. The times he absolutely refused to obey U.N. directives. That he sponsored terrorism. Oh gosh, I just don't have enough crayolas to help the liberals grasp reality.