So what's your point? If the cleanup cost is $60 billion, they're still profiting $186 billion, cut 40% of that for lost stock/investment. They end up still making close to $100 billion in profits, not too mention another $236 billion in assets. What's the Maximum the US can charge in fines? Probably less than the $100 billion they will profit this year. You're not making a case for yourself.
Will it hurt them severely, yes? But, not enough to make them go even close to bankruptcy.