For sunnis and shi'ites to fight each other is a way of containing and restraining them. Authoritarian rule and not democracy, prejudice and discrimination is obviously as old as the stone age. However, this would not happen if the Saudis and Iranians did not want all the money and power for themselves or were not afraid of losing what they have. Leaders who are demagogues do not care about the millions of poor people who suffer or are killed or hurt as long as they retain their wealth. Democracy and tolerance is a modern age idea as well as caring for the poor. It will take hold or not. It could take a long time for any of these ideas to be planted around the world, if they can be planted at all. Don't forget China and North Korea. Maybe one day the people will learn to defend themselves from totalitarian regimes.
Roadside bomb kills five border officers in western Iraq (AP)
from the article: Ignoring the chaos