Your ideas about central banks are seriously outdated. Their role has diminished as markets have grown gigantically. Central banks only deal with puny amounts compared to the global markets.
But according to you, the puny amounts that the Fed transacts scare markets that have vastly larger amounts into fulfilling the goals of the Fed. I'm not persuaded.
The facts show the Fed has failed repeatedly, year after year to reach its inflation target. Likewise, the Bank of Japan has failed for the better part of a generation.
The facts show that the Fed's multiple QEs have failed to lift the economy anywhere near 3% growth.
The Fed isn't the god you think it is. But I understand that conspiracy theorists always nitpick anything that contradicts them.