Genetic evidence of our origins is only considered theoretical by people with an agenda that cannot coexist with reality.

The modern form of humans developed in Africa, then spread out from there.

Other primates closely related to us did the same. There is even evidence that some of them were able to breed with us. Tibetans apparently have traces of another human subgroup's genetics, which might explain how they are a bit better adapted to high altitude living.

Fascinating stuff, genetics, but it is complicated, not uncertain.