Do any of the heroes actually succeed in taking vengeance for their dead parents or family and relatives?
It just seems like the murderer of their parents (or other family members) is either already dead, killed by someone else, falls off the cliff and dies, becomes a monk or commits suicide. It just doesn't seem like the hero actually commits the act of vengeance.
Do they even kill anyone (not counting soldiers from the opposite side or small not so important people)? Yes, I'm aware that little Guo Jing stabbed and killed Chen Yuan Feng, but what about adult forms of the characters?
It just seems the heroes remain pure that way.