In response to your statement that the human species is not the one that you recognize I have to agree with you. Not only the Aiel are different but all humans are different. Take for example the domineering women in the story. All of the Aes Sedai, (particualy Siuan, Cadsuane, Moraine,) Alivia, Sorilea, Reanne to give a few examples manage to wrap everyone around their fingers through their strength of will. I have never encountered a single individual that possessed this ability. I just assumed that Jordans world was sort of like Tolkian's - that the will was infused with some kind of magical power. Accordingly I simply took Jordan's description of the Aiel at face value. If he wants them to overwhelmingly dominate militarily than I accepted that they would be the way he described them. After all it is one of a writers prerogatives to bend reality however they want it.