People worry that computers, robots, interstellar aliens, or Satan himself - brilliant, stealthy, ruthless creatures - may seize control of our world and destroy what's uniquely valuable about the human race. Cultural Evolution and its Discontents shows that our cultural systems - especially those whose last names are "ism" - are already doing that, and doing it so adeptly that we seldom even notice. Like other parasites, they've blindly...