I am very much against witchcraft in real life, so I am not going to partake of it in a game. It has to do with my Christian beliefs.
Presumably you are against hitting people with poison clouds or running them through with swords in real life too, but happy to do it in-game? You do understand that it is a game right?
Oh, I understand it's a game. But it is you who do not understand.
If I'm going to kill someone (who deserves it), I can choose whatever weapon I wish. There is nothing inherently evil in a sword. Witchcraft, however, is a different story.
It may be a game, but I still have standards.