There are certain types of cultures that attract certain types of personalities. BDSM attracts "more" people with personalities that are on or over the edge. That's just the facts, the nature of the beast. It's an extreme fetish, not peeing on each other in the shower (which can be fun btw)
It involves sadism, it's going to draw sadistic people. Not all sadistic people are upstanding citizens who respect boundaries and care about others, are they? It's a very convenient lifestyle for someone who is truly just a violent sociopath to blend in. Kind of like a candy store for a fat kid.
Be safe, know what you are getting in to, know the difference between what you fantasize about and actual reality. Most importantly, know who you get to "know" more than you would most people. It's not just sadistic males either. I can say the most twisted person I saw in the lifestyle was a female. She was fat and unattractive, at least to me (and most normal men). Maybe that's why she wanted men who were masochists to take out her lifetime of getting ignored on, who knows.
Minx seems level headed, I'm not worried about her.