So long as any species doesn't live in solitude, there's going to be a pack mentality. it's how nature works, there's always going to be somebody who wants to establish dominance and leadership, hence the pattern begins again.

that and I don't know how people expect to survive in anarchy (unless I'm missing something). I mean the whole reason we have civilization is because of advances in technology for the purpose of ending suffering, saving lives, or making life easier.