Okay so I can't understand how exactly the peoples of the realm regard summoners?

According to the wiki page it mentions something about demons. Are the primas demons? Are the summoners some kind of warlock? Or is the wiki just giving a description of what the primals appear to be in the minds of the local population.

Really like the class but I have never been a fan of playing the evil Mage type running around with demons.

Any info on this would be great thanks!