by TurncoatThey help them because if they don't they'd feel worse about themselves. It's still self-gratification, it's just done through using another as a sort of proxy for it.
Somewhat of a tangent, but have you ever read up on Survivor's Guilt?
The idea that "they would feel worse about themselves" is a massive assumption. They might very well feel nothing at all. If I help someone I don't think about it, I just get on with what I was doing.
Yeah, I think Ed summarized this well. Never mind looking for perverse motivations, there are assholes and nice people.