As long as you pull your hand away from an open flame, who cares whether you do it because it hurts or because some feedback algorithm says withdraw if heat flux exceeds critical T? Natural selection doesn't care about motives. If impersonating something increases fitness, then nature will select good impersonators over bad ones. Keep it up long enough and no conscious being would be able to pick your zombie out of a crowd.
Reality is merely an illusion, albeit a very persistent one.
