Anarchy leads to the strongest animal in the jungle. Power hates a void. I see no difference between a tribe rules by a chief that determines the rules and a government over people. At least with a government, people get to choose their leader without losing their head if they didn't choose wisely.
Anarchy has never worked.
Even Genghis Khan was the leader of his horde and I bet there were rules that none of them would break in fear of death.