The Most Violent Race or Culture

Is there any one race or culture of people who seem more violent than others?

Certainly, whenever one watches, listens to, or reads the news, just a few groups of people dominate the stories involving crime, violence, and war. Middle Eastern cultures seem to have a tendency to gravitate toward violence. Whenever there's an act of violence, hordes of people fill the streets making matters worse, often causing events to escalate into something even larger and worse than it was. You never see news accounts of the Danish attacking another country, or reports of a band of renegade Canadians descending on the United States, raping women and burning houses as they invade.

Are black, or Hispanic cultures or countries more likely to cause the destruction of property and commit crimes against others, or is it a matter of selective recall that we view them that way?

Is it nature, or nurture? Are angry, violent people predisposed genetically to upset the world and cause trouble wherever they go, or is it the conditions of poverty and discrimination that leave them with no option?