First. The banking system has lost the makings of an entity sticking to market laws. The last financial crisis has produced ample evidence of it. The banks displayed lack of vitality. If not for states lending a helping hand, there would have been no banks anymore, they would have all gone to the wall and vanished by now. Buying out dubious bad debts, acquiring shares in capital stock, granting various stabilization loans, the US and Western Europe injected flows of money into the system.
The US has injected around two trillion dollars of taxpayers into the banking sector. In fact, it was nothing else, but the nationalization of the largest financial bodies, the Wall Street topping the list. The banks nationalization in the United Kingdom was no less impressive.