Hmmm....I think everything depends on what is considered a social norm. In Nazi Germany all the above was acceptable as long as it was directed towards those not included as members of the future supreme race. It goes to show that a people that consider themselves superior tend to show these aggressive trends towards the inferior race. Look at the American Native Indian when America was invaded by the European nations. Look at the blacks of Africa that even in their own country was treated by slaves. I guess tribal is as tribal does with the mentality of "As long as its not me or mine."