It is possible that it's a combination of both. But really , having that background information about the Aes Sedai in Seanchan fighting for more power does change a lot in my opinion. You see why they might have thought that channelers are dangerous and untrustworthy... because they actually...
Huh, I didn't realize they might have had Aes Sedai in Seanchan before the arrival of Luthair... infact I never thought of Seanchan as a place that has also existed during AoL :look This raises more questions in my mind now :look
I should have read more carefuly in the BWB:
"Aes Sedai, who made...
Yes, it would still be bad. If there was an a'dam way to shield a man from the taint on saidin, this would mean there is a way to heal or at least conceal the taint, therefore the Aes Sedai/other channelers could heal and/or remove it in general (which is found later in the books as possible) ...