It is genetic. They went through a genetic bottleneck some time in the relatively recent past (less than 100 000 years) and whatever they are now is some sort of defective genome far enough removed that they can be called a separate species of human in my opinion.
I consider them genetically distinct enough to be considered a separate species because their entire genetic line has all kinds things built into it like poor eye sight, they are virtually all kind of autistics with severe obsessive compulsive style behaviours, they obsess over abstract symbolic form, converting language to that abstract symbolic form and then taking ideas apart and puting them back together again without any care for what effects that will have, and so on.
Virtually no other species of human has such a uniform distribution of attributes within their genetic line, except for niggers.
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