Anarchy can never be achieved. Humans need order and rules, sure things will go down hill quickly but most people will try and carry on like normal while others form gangs and answer to a leader which beats the point of Anarchy. Think of it like your in school, your teacher is off for 1 lesson and you act like an idiot and do what you want, eventually you settle down and just talk. We are social creatures that need a leader, we can never have a every man for himself world.