Why slap the banks on the wrist with punitive damages when you could cut them off at the knees by actually making systemic changes to address some of the root causes of these types of bubbles?
The answer to your question is simple: Wall Street runs this country. The people in charge of making US bank policy have all come from the banks themselves.
http://themoderatevoice.com/93909/wall-streets-control-of-ec...