What I meant here was even if we believe the premise that, say, everything was done with the banksters in mind, it doesn't mean that the banksters, or the subset of them dealing with housing issues, or their lobbyists, really have a big picture sense of what's good for them. You know, their model shows how doing X will give them a bunch of extra money on some set of mortgage securities, but doesn't take into account that throwing millions of people out of their homes might cause them some additional problems.
I don't actually assume that Our Galtian Overlords actually know what they're doing most of the time.