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The difference between nuclear war and a market is much much wider than the gap between derivatives and the underlying market. It is your straw man analogy that is ridiculous. Look, the Fed itself says that the goal of MBS purchase is to support housing markets:

> What was the policy objective of the Federal Reserve's program to purchase agency mortgage-backed securities? The goal of the program was to provide support to mortgage and housing markets and to foster improved conditions in financial markets more generally.

https://www.newyorkfed.org/markets/mbs_faq.html