The Federal Reserve cannot guarantee a 100% crisis-free economy,...

The Federal Reserve cannot guarantee a 100% crisis-free economy, but I'm sure it does its best. The GFC was caused by uncontrolled borrowing and lending, on an international scale, which was not the Fed's fault if you'd care to do a bit of reading as well.

The Fed cannot stop people borrowing housing or anything else, in the end the sheep got fleeced, as they quite often do.