Achtung, I think it's the fact that they don't really know anything about the ethics of witches in general, much less a Christian witch. Actually, most of them probably don't even realize that such a thing is possible.
That, and the ex-active in question was involved with some boy-stealing scandal that had the house in an uproar. Honestly, though, she was just trying to get attention from her sisters who had been alienating her. So there was bad mojo, which I guess made it easier for the sisters to point fingers when they had allergic reactions and stress-induced nightmares. In a house that tense, who
wouldn't have nightmares?
I'm just scared that if I come out, if I ever get in an argument with someone and their, oh, I don't know, computer crashes and they lose the 15 page paper they've been slaving on nonstop for two weeks, they'll blame it on me. I don't even have the 'Christian' thing to protect me.