I would argue that the violence, and I mean social violence rather than 'man kills unfaithful lover' violence, has its roots in the inequity of private property society.

Physical force is the ultimate line of defence of any privilege. From the security guard in the shop, to the police beating back protestors or the current war over energy resources. Social violence follows economic competition (buyer vs buyer, buyer vs seller, seller vs seller). For example, buyer vs seller, the US in need of energy resources and unwilling to negotiate with the seller (middle-eastern oil producers) use physical force to ensure domination. Or seller vs seller, race riots - the locals versus the migrants who are perceived to be a threat to the labour market.

Thus, until we can say we are all at liberty or free to democratically control the resources on which we all depend and free to enjoy the products of those resources there will be incentive to violence.

Piers