Even though I did enjoy the episode, I didn't really "get" the ending.  Even if he took the father's compassion, it doesn't seem to follow that the father would kill him to stop him from taking his daughter.  Specifically, he would be easy found guilty of murder and, if he had thought about it, he would have been taken care of by Salvadore now that he has compassion for him.  I don't remember the TZ episode, but now I can look for it.