[ChotooMotoo]

They have to think that the people they are fighting against are less than they are. If they waring parties thought of eachother as equals, they wouldn't be able to kill eachother so easily. That's the psychology of war. The problem is, they get indoctrinated that these people are evil, and deserve to be treated like garbage, but then they meet some of them and realize they are fully human after all, and it messes with their heads. Look at all the soldiers comming home suffering from serious mental illnesses.