The OP's quest did surprise me and I did feel kind of bad for him.
Another one was the one where some woman wants me to stop her mother from becoming a Hagraven and we end up having to kill her mother.
http://www.uesp.net/wiki/Skyrim:Repentance
Yea, I remember that one. I discovered that place with my 4th character! LOL I was like OMG I still haven't seen it all! And then Illia became my follower! At first I thought she would betray me at the end... yea, I also felt a bid sad for her, but man, who wants a Hagraven as mother? LOL
Haha, my guy is just an opportunist, you know? He will do many things to become more powerful, but I saw no reason to kill her. Didn't benefit me much, so I declined. Plus, she lost her sister to a nutcase, so I felt kind of bad.
Opportunist eh? That's saying it lightly... cannibal vampire opportunist LOL But yea, I know what you mean. It's more of a psh, why should I trouble myself with that girl kinda thing, not because you felt bad for her! =p