So why is BP in trouble? Remember the Texas refinery that killed 10+ people, the Alaska pipeline leak and shutdown of oil flow from Prudhoe Bay, the propane market manipulation and the gasoline market manipulation? Is there a pattern building up? Exxon and Chevron don't have a huge presence in the financial markets like BP and Shell. So it looks like when you combine poor operating procedures with market manipulation you get the wrath of the regulators and the investment market. Fair is fair they are getting all the flack they deserve.