Just because Exxon was let off the hook for the damage they caused, doesn't mean the next offender should be as well. Its the old 2 wrongs don't make a right thing. The goal should be making industry adhere to environmental and safety regulations to avoid these types of incidents, not appeasing shareholders of the corporations who violate the rules. Accountability should be applied to corporations as well as individuals.
Don't get me wrong, I am not an eco-nut but my definition of sustainable development means that we extract the resources while doing everything reasonable to ensure we don't f*** up the surface and ground water where we find the resources.
If it had been Exxon responsible for the Gulf of Mexico oil spill, the Americans would not have treated it as harshly as they are treating BP.