Check out this article by Dov Barron:
The world is at war today. This is not a news flash. It’s the way things have been most days since the beginning of history.
Sometimes these wars seem to be about land or borders. Sometimes they seem to be about race or tribe. Sometimes they seem to be about color of skin or religious beliefs. Sometimes they seem to be about important matters and other times they seem to be about insignificant differences.
But the truth is that all war is about one thing, and one thing only: Someone has decided that X is right, therefore Y and anyone who believes Y is wrong.
Here is the link: http://dovbaron.com/2013/12/08/nelson-mandela-the-leaders-leader/