It's a common feature of any demographic that is convinced of their moral superiority. Once you've accepted that you and your leaders are on the side of justice and are presented a designated enemy, you cease having to look inward. Progress requires acknowledging that you are operating inside of a flawed system, and that you have to work with people from other systems who acknowledge their own flaws.
Tangent: "Enlightened centrists" acknowledge the flaws of both sides of an argument while failing to acknowledge that both sides have to play fair.