What's the effect of government's doomed to failure mortgages capture?

Tell me the pros and cons of this action done by the government.
And is it in reality possible? In US it values around $12 trillion
Answers:
Its a good idea but to costly. When the public get the price tag it becomes politically impossible. Why should the public earnings 12 trillion for the bad bank when for that manner of money they should be getting the good?


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