[Republic]

Put it to 1400 years of inbreeding. Starting with mohammed who married a first cousin. islam is the only culture in the world that sanctions marriages to first cousins..several islam countries have over sixty percent of muslims married to first cousins.

inbreeding leads to the rise of recessive genes, damages the genetic pool and can result in mental problems that lend owner towards violence and other mentally skewed behaviors.

In Briton, islams present 33 % of those seeking mental health help yet islams comprise only 3% of the population.

Info from article by Ann Barnhardt.

[FreedomPoster]

If you search on Arab consanguinity and related terms, you find any number of scholarly publications on the topic that back up your post.

Beyond that, see tagline.