First, that link is not a "law". They're promulgated regulations which are different than a law.
Second, its hilarious that the wingnut contingent who spent a lifetime yelling "get government out of the way!", and lecturing us tree huggers that offshore drilling was a totally safe and excellent adventure, are now the ones who are whining for the government to solve the spill.
Third, I would trust Mott's knowledge of environmental law over yours in a heartbeat. You repair lawnmowers, and randomly post stuff you read on rightwing blogs. Mott is an environmental scientist.
Fourth, you posted a monstrosity of a PDF, hundreds of pages long. I'm sure you didn't read it, and you have no idea what is actually says.
I'm not going to pretend to be an expert on these regulations, but I'm fairly astute at navigating and understanding environmental policy. The regulations clearly state that the responsible party is responsible for stopping the discharge. That means Mott was right, which is no surprise.
The regulations give the government the authority of oversight and coordination of clean up efforts by the responsible party and local, state, and national entities. It looks like the regulations could theoretically give the government the authority to actually take over efforts to stop the discharge if the responsible party can't do it, but the government doesn't have the equipment or expertise to plug a blown out well a mile down on the sea floor. So I see no feasible alternative but to require the responsible party, BP, to plug the well. That's the way I read it, but your PDF is like 500 pages, so that's just a cursory review of it. I'm still going to go with Mott the environmental scientist's opinion, over the musings of a lawnmower repairman
Finally, as always man, thanks for the outstanding comedy!