Nothing they do or believe makes any sense and learning more about them or trying to understand them isn’t going to improve that.
When cousins marry cousins marry cousins for centuries, insanity is the result. And they think that’s something to brag about - it keeps their line pure etc.
Even madness has a method.
These people have 13 centuries of having it givn to them with their mother’s milk that they are supposed to rule over everyone else.
They are establishing colonies throughout the west to this end, because we allow it.
The best thing we could do is lock them in the middle east away from their oil and tell them they will be allowed to rejoin humanity when they grow up.