One of the driving forces of our daily social interactions and the motivation behind most wars and current terrorist situations is a fascinating thing we can call the "Us vs. Them" Theory. Check it out in a book called The Psychology of Hate by Robert Sternberg. Basically, people form sometimes arbitrary and usually stereotypical images and prejudgements of people (unfortunately, stereotypes exist because, in large part, they are TRUE). People separate themselves from each other, and anyone deemed "us" and deemed similar is good, and all those deemed "them" or deemed different is bad. Be it family, class, social group, political party, or religious affiliation, these judgements and classifications are made and acted upon on a daily basis. Anyone who becomes "them" is someone to defeat, to convert, to assert authority over, to judge, to dominate, to eliminate, to guard against. This is why people war, why terrorists attack, why we hate, why we destroy. Why nothing will be solved when terrorists continue bombing the "infidels" and we keep retaliating against the crazy jihad kamikaze Muslims. Why there is incessant war in almost every African nation between two (or more) different races or social classes. Watch Hotel Rwanda- the two classes of Africans there were originally chosen by the occupying Dutch out of one amalgamate race, on the basis of facial features and height, Hitler white supremacy Aryan nation style. And now those two African races in Rwanda can't get past the arbitrary walls defining them and continue overthrowing the oppressors, each other. IT IS RIDICULOUS.