Well, using black magic doesn't make you evil, if that's what you're saying! Come on, do you think I could be evil with a face like this?

[ She sticks her tongue out a little, playing up the cute factor a little. It's bad enough that the common word on her back in her world is that she's a village-destroying monster. Nobody here needs to know about that reputation! ]

Anyway, black magic does tend to be more on the destructive side of things. All magic has a source, and the power for black magic does come from what you might call demons, but that doesn't make anyone who uses it bad. It's pretty common.