But what is the right thing? Fannie and Freddie shoved mortgages through the pipeline to both increase their profits and fulfill their stated goal of increasin

But what is the right thing? Fannie and Freddie shoved mortgages through the pipeline to both increase their profits and fulfill their stated goal of increasing American home ownership. The latter is what most considered to be "the right thing" including their regulators. But then the law of unintended consequences reared its ugly head, housing prices started to fall and we all realized how tied together that securitization pipeline had become. Investors bought credit swaps on their mortgage bonds to protect their downside and move the assets off their balance sheets in order to buy more mortgage bonds—also allowing retail banks to create more mortgages, further increasing home ownership. The companies who sold those swaps (AIG) assumed that housing prices would never fall and default rates would never rise. They were wrong. As soon as that black swan event happened and Bear, Lehman et al had to start marking losses on those MBS products, the market pounced. Then AIG had to start paying those swaps but couldn't (hence the nationalization). While there were definitely bad actors (those handing out liar loans and so forth), at any individual stage in that massive, trillion-dollar pipeline, most actors were behaving in a way that rationally made sense. Banks sought to hedge their downside by buying CDSs against their MBS products. Insurers trusted the ratings agencies. The ratings agencies were too weak to do anything despite internal misgivings about those MBS products (and of course the incentive structure there is all sorts of stupid). The investment banks definitely twisted arms at the ratings agencies to get investment-grade ratings on what were truly junk bonds and that was bad on their part and arguably fraud, so yes, someone should probably be liable for that. But what could've been done differently at the macro level to ensure that every actor in that pipeline acted in the interest of the "greater good" when we can't even define what that is? Yes, we could have tighter controls on mortgage underwriting standards but will that prevent the next crash? How do we hold someone liable for not avoiding a crash? We can't even tell when a crash is coming, are we honestly going to blame someone for not being able to do the impossible?