Its a very sad truth Moses.
Not just with Arabic (Middle-Eastern) nations, but many other nations as well.
Even in Australia, in rural towns that are isolated - deaf, blindness and other flawed traits are prevalent.
I'VE SEEN THEM.
The Aboriginals barely survived this affliction by carefully arranging 'external' marriages from as afar a tribe as possible. Hence the luxury of a man going walkabout without fear of being attacked, in search of a wife. Even still - the Aboriginal gene pool was an incredibly fragile one that nearly got wiped out like a sneeze from a tissue-achou!!
Many races/cultures believe that to 'outbreed' the enemy (any other people): you have to have your men inseminate the other women, but keep your women from other men.
This is flawed in a few aspects that come lacking (you can see what part of the body is missing on this one) with the fact that besides the male contribution being no more than a $2 dollar coin in the slot to decide wether it is heads (boy) or girl (tails) and only really 25% of the genetic makeup.
Closed 'racial' nations like Arabics, Chinese and other nations that only export and don't import new genetic eggs and sperm into their pool eventually 'collapse' from within.
They become nothing more than 'Replicants' - people who look similar and can only 'follow the guildlines' rather than think for themselves outside the circle or even square. To think that a little Nipponese kid who can play the violin at the age of 7 is a genius is a false illusion of a kid who just 'copies' like a dog that can do tricks. A Replicant.
The nations that have a gush of innovation, success, achievements and population growth for all the right reasons are the ones more 'free' in their immigration due to not only 'racial' mixing - but 'cultural' mixing too!!!
Unlike animals - thoroughbredness in Humans is actually a genetic weakness.
The more varied and distant the genetic combination - the healthier, longer-living, intellingent, wiser and beautiful the off-spring are. If they aren't attractive externally, they are very much so internally in what they achieve in life.
A weak and jealous man is he who only allows his sons to sleep with other women, but no other men to sleep with his daughters.
We know some races of women - endeavour to outbreed other women, by placing themselves in a position of poverty and rape to guarrantee that they pump out more kids than the other women. These women also LURE men by such things as 'their seed' or male 'lineage' being carried on (...as if that matters

) like in Royalty. This also kinda starts wars too. The 'animal' idea of the strongest sperm is better. Some women swear by this and have sex with many men in the one time to guarrantee the strongest sperm reaches the egg.
These women tend to deny that its the male that chooses the sex, is only responsible for 25% of genetic makeup, etc as it would throw a spanner in their works of starting a fight.
There is something about this 'REGION' of the world that is distinctly different to the rest of the world.
Its future is unique in it's place in the scheme of things and it doesn't matter what 'types' of people come here - they all change towards that uniqueness that moves them away from any of the own kind in other parts of the world.
I look at guys like me 'racially' from other parts of the world - they are not like me at all in many, many ways.