CleverCover said:
I know, but I can't see how she's willing to use it even after practically every blood magic user we fight seems to lose themselves and everyone they love to the demon. Even Anders is a bit iffy because he has moments where he can't control himself and his reactions. Or even use the mirror after seeing what happened to her two bestest friends in DA:O. I really don't think she knows what she's really doing with it.
I think the greatest problem (for me, at least, as I haven't finished the game yet) is that the factors surrounding Merrill's acquisition of her blood magic are unknown. We have her word that was offered the knowledge without spirit asking for anything in return, and she doesn't seem like one to lie, but that does go against how transactions with spirits (demons) have been shown to go. She's clearly not an abomination, though.
I suppose I might find out during her act 3 quest, once BioWare finally release that patch...
Anyway... blood mages do usually make their deals out of fear or hunger for power. Some of them are simply insane. It's not he blood magic that is the issue, though, but rather the deal they make. If you think you're going to die, you might very well give up your will to a demon if it gives you an additional 5-10 years to live first, for example.
EDIT: An example of a blood mage who made some bad decisions, but seemed to still be a nice person who was very much in possession of all of his faculties, was Jowan from the Mage Origin.
CleverCover said:
And I don't know about the all spirits are dangerous thing. She's never met Grandmother Wynne and have her ass saved by the spirit that resides within her. Or actually met Justice. Justice was cool peoples.
Thing is that all spirits are supposedly personifications of a single human trait, which is part of why they're so dangerous. Take Justice, who is a spirit of "justice". It became clear to me almost immediately after picking him up on Awakening that his "justice" is little more than "vengeance". Only his sense of pride in being a "good spirit" really keeps him from being a rage demon.
Wynne's spirit is obviously harder to place, and does seem like a completely harmless creature... but that can just be because we never actually got to know it. Because it had already sacrificed its own existence to save Wynne. And what would happen if one of these spirits had instead become attached to a human like Loghain?