Too much inbreeding, like 40% of the population.
To better understand the nature of the people aside from being Mohammed’s Cult followers....but when you mix the two...you have a war machine....
“He will be a wild donkey of a man; his hand will be against everyone and everyone’s hand against him, and he will live in hostility toward all his brothers.”.... Gen 16:12
.......”his hand will be against every man, and every man’s hand against him”.... signifying, that he would be of a quarrelsome temper and warlike disposition, continually engaged in fighting with his neighbours, and they with him in their own defence;....... and such the Arabs his posterity always have been, and still are, given to rapine and plunder, harassing their neighbours by continual excursions and robberies, and pillaging passengers of all nations, which they think they have a right to do;....
... their father Ishmael being turned out into the plains and deserts, which were given him as his patrimony, and as they suppose a permission from God to take whatever he could get.
And a late traveller into those parts observes that they are not to be accused of plundering strangers only, or whomsoever they may find unarmed or defenceless; but for those many implacable and hereditary animosities which continually subsist among themselves, literally fulfilling to this day the prophecy of the angel to Hagar, Genesis 16:12; .....
....the greatest as well as the smallest tribes are perpetually at variance with one another, frequently occasioned upon the most trivial account, as if they were from the very days of their first ancestor naturally prone to discord and contention.
(”dwell in the presence of all his brethren—dwell”.... that is, pitch tents; ...... the meaning is that they maintain their independence in spite of all attempts to extirpate or subdue them.)
Resource: Gill’s Exposition of the Bible