Violence is an occassional necessity; if 40 people havea leader, and 10 people refuse to cohabitate, refuse to leave, and demand the other 40 people suscribe to their ideas, then violence might become necessary. Yiwa's describing them having the option to leave rather than follow the leadership agreed upon or requiring violence to settle the dispute.
Yiwa, do you believe 50 random westerners would naturally revert to band-organization? One of the problems in modern society is the distance from our natural environment; while there's likely a number of random skills useful in the group, there's a distinct possibility a number of people who treat it like Survivor.