If you are Roleplaying in Warhammer Online do you get into contact with some non player characters? I think they are very hard to beat. I think that I would have more chance in fighting with another player then with the non player character. I like role-playing, but not if non player characters are involved.
You should not let one bad experience with non-player character gets you so down. I think that this is nothing to worry about. Non-player characters are not anything that you should be afraid of and there is nothing that they can do to you, that other players can't. Even if you decide to go to player versus player mode or solo play there is no guarantee that you will not cross your path to some non-player character. Role playing is a great thing to be involved in, and if you think like I am thinking then you should stay with your role playing mode of playing and be more prepared for the next close encounter with any other creature that is featuring the game.