It is much more than that...Think seriously about islamic laws concerning women...they are slaves period! They have no rights and are the spawn of the devil....great way to start out life.
If a father has any love for a daughter there is only one way to oversee somewhat her safety and that is to keep her in the family where he can cause enough trouble to keep her husband treating her well...If he marries her outside the family he can not keep her safe...so any father who has a smidgen of love for a daughter under islam must keep her close.
Like usual islam is the problem and the cause of the evil in the muslim world. It is a religion that needs wiping out for nothing good and wholesome springs from it.
The barbarity of Islamic social behavior has one source: and that is the bloody-handed, delusional, lecherous, but fabulously effective religious charlatan known as "The Prophet".
This barbarity comes down to the present day in three forms: the Koran; the Sunnah; and Shari'a.
The Koran (basic scripture), regarded as being directly authored by a spirit entity known as Allah, and thus intrinsically unreformable, is in many respects a handbook for abuse.
The Sunna (biographical account of the life, habits and practices of Muhammad himself) will be found to be full of crimes, perversions and atrocities, all presented as morally exemplary.
The Shari'a (legal code) based on the Koran and the Sunna, is an authoritative --- and in many unhappy parts of the world, enforceable --- formulation of thse barbarities into mandatory practice.
This has nothing to do with the genetic deterioration of various populations. It can infect people of any racial background in a single generation via constant propaganda and intimidation, whether they are the offspring of 50 generations of cousin-marriage or not.
The genome deterioration and subsequent rise in disability is a tragedy, but in the geopolitical context, a distraction. The problem is not Arab inbreeding. The problem is Islam.