Well there are lots of reason for sure, denial, delusion, wishful thinking, ego maniac, infantile understanding of ancient writings, Satanophobia, Xenophobia, out of touch with reality, limited choices scrapping the bottom of the barrel,and many more.
Listen to this Ted talk and see if you can pick out something that helps explain why these guys are such ass holes:
Organizations are often run according to “the superchicken model,” where the value is placed on star employees who outperform others. And yet, this isn’t what drives the most high-achieving teams.