Airforce
Lets think about what in fact Bernanke is doing.
We have all come to understand that the Federal reserve Note is just an IOU between the United States of America Corporation and the Federal reserve bank.
The mortgages he is buying are in most cases not actual mortgages, but resale derivative packages, Which the original property has been resold up to two times to new owners with good paperwork and tracability. These mortgages were the basis of the 2008 bubble burst.
Thus we have a worthless mortgage being paid for with worthless money. This is a no loss situation since these derivatives are what is dropping the preceived value of the dollar.
Since the forgiveness of Mortgages is happening throughout the Fiat Money world due to poor control and separation of the property from the note how better to clean up the bogus scam and let Uncle Sam pay for it AGAIN. (880 billion Bush bailout.)
This will protect the restructured mortgages that the courts are enforcing from the court denying all mortgages.
Soon they will be able to say that all of the MERS Mortgages are gone, and the Fed will declare a bulk loss while maintaining a base of if not legal at least properly documented mortgages.