If you want Halsin because he's a great healer, for instance, you have to save him from the goblin camp. This naturally puts you at odds with the goblins, not necessarily because you're being good as because you need the healer.
But that's the point. I 'risk my life' rescuing Halsin because he might help me. And Halsin is actually fighting beside me against the Goblins, so I owe him.
If the Tieflings would take up arms and do their part, I might be more inclined to help them. But why should I risk my life for people who tell me I should get rid of the Goblins' leaders without any backup - while they sit at home drinking a nice cup of cocoa and awaiting the return of their savior?
Yes I know, I'm taking the game's premise too serious.
