I wonder how many people realize this. I certainly didn't.
Big Oil's real horror was not the spillage, which was common enough, but because it happened so close to the US. Millions of barrels of oil are spilled, jettisoned or wasted every year without much attention being paid.
Big Oil is usually a poor country's most powerful industry, and is generally allowed to act like a parallel government. In many countries it simply pays off the judges, the community leaders, the lawmakers and the ministers, and it expects environmentalists and local people to be powerless. Mostly it gets away with it.
The only reason oil costs $70-$100 a barrel today, and not $200, is because the industry has managed to pass on the real costs of extracting the oil. If the developing world applied the same pressure on the companies as Obama and the US senators are now doing, and if the industry were forced to really clean up the myriad messes it causes, the price would jump and the switch to clean energy would be swift.