Governments don't bite the hand that feeds them...
You have this wrong.
It was government that created the whole sub-prime mortgages problem in the first place.
Banks wouldn't lend money to poor people, politicians turned it into an "OMG RACISM" issue and pressured banks to lending money to people that would ordinarily be refused.
Unsurprisingly the urban poor weren't able to make their payments and the rest is history.