Moslems believe their holy book, the Koran, is infallible. Because it was written by God's prophet, Muhammad. God is white. Therefore, blacks are not human. Of course, we haven't but many psychological explanations are of this sort.
True understanding involves much more of an explanation than just a name.
They apparently feel they have solved the problem. Obviously, solving a problem involves specifying all the necessary steps for getting where you want to go, not just describing the final destination. Such persons think only of final outcomes, not of the process of getting to the end point. If something can go wrong, it will. In short, making mountains out of mole hills.