I could probably state a million different examples, but the one I'll use is Merrill from Dragon Age 2. To sum it up to this point, Blood Magic is seen as evil, corrupting, and involves demons, and 99.9% of the time, shit ends up going wrong in any deal with Blood Magic in it; and seeing and knowing all this, Merrill WILLINGLY makes a deal with a demon to try and restore the elves to their former standards. The Keeper (leader) of the clan ends up saving her retarded ass by absorbing the demon, leading to you fighting her. After the fight, you leave the cave and her entire clan blames you and hates you for killing the keeper, and you have to fight and kill every single one of them.
Congratulations Merrill, you just lost all of your friends and family because you're a retarded *****!
(Oh, and as far as I've played the game (on my third playthrough now) this is COMPLETELY UNAVOIDABLE.)