>>13481
>What caused the financial crisis of 2007–08?
aka
What caused the housing bubble?
What caused the subprime mortgage crisis?
A: Moral hazard and systematic risk.
People and banks will externalise loss when they can get away with it. When papa the state sets itself as the buyer of last resort, you encourage banks to behave in such a way.
As for "deregulation", it's an easy answer from those who don't have explain what they are actually going to regulate. How do you regulate the trading of toxic securities or the issuing of bad loans when nobody initially knows which assets are toxic or which debtors won't be able to pay?