One of the oldest strategies that has been employed by the rulers is to get their subjects to wage war against each other. When distracted, the slaves are less likely to rebel against their masters. By keeping their subjects focused on fighting each other diabolic behavior will go unnoticed.
By getting groups of people such as the left versus the right, the rich versus the poor, men versus women, young versus the old, the Christians versus the Muslims creates a diversion that allows the rulers to escape the scrutiny of their subjects.
Another strategy that government use to accomplish their goals is to create crises that cause the people fear what will happen in the future if the government doesn't come to the rescue.