Buffett tells the bond insurers to sell him the good stuff and
they can keep the bad stuff. The idea is that he'll take their lucrative and stable business model off their hands and leave them with the crap. It might be the only legitimate way to keep them out of bankruptcy and provide them with cash to at least delay the Shitpile Day Of Reckoning. But this was their lucrative awesome business model before they branched out into fake insurance for big shitpile, and they understandably aren't going to be thrilled about giving it up.
