"When one person pushes on this wall it is stationary; so if two pushed it would move" The action of the Fed is not constant; it is a reaction to the level of

"When one person pushes on this wall it is stationary; so if two pushed it would move" The action of the Fed is not constant; it is a reaction to the level of inflation/deflation. When the Fed is succeeding in meeting their target, any variation in inflationary/deflationary forces is cancelled. Of course, Fed interventions are not perfect at accomplishing that goal; they don't always have the force to meet their targets, and all interventions have side effects. But to treat the Fed's actions as independent of economic conditions seems to mischaracterise its function entirely.