I used to be one of two BDSM "gurus" in a local adult shop that specialized in being open, airy and teaching seminars etc as well as having an approachable, long term staff.
I've been out of the Scene for many years but I'd be happy to answer questions to the best of my knowledge.
Since I don't know a lot about that culture, is there something in that community that appeals or repels people with a history of abuse, or forces them into specific roles? Is that healthy psychologically or does it break one more?
There are many people in the culture with a history of abuse and little to zero boundaries. This is rampant but I'm not going to suggest that it's all that worse than the rest of the world.
Forcing people into a role isn't typically what it's about. Often, the timid will want to be dominant and the in control type A will want to be submissive. Some people are 'switches' map earning they enjoy playing both roles, at least from time to time.
Basically, in a healthy BDSM type relationship, it is based on explicit trust, caring and safety. There are typically strict guidelines in all aspects...even just going to a BDSM club.
A solid Dom/me will do things after spending quite a lot of time with a sub and getting to understand their desires, the why's, what their hard lines actually are and establishing the all important safe word. Many will actually draw up a contract of sorts or have a lengthy questionnaire.
In an ideal situation with a solid, knowledgable Dom/me, a safe place can be offered to a sub interested in exploring these realms and it can be extremely bonding and emotionally cathartic.
Btw, many, many times, sex is not part of the game and not a goal. It can be but it isn't right to assume it always is.
Many hurting people do flock to this. I remember every weekend at our club, there was this little, dapper, be speckled guy pole dancing in assless chaps with a BIG smile on his face. He was the sub of all subs, happy as a clam. His thing wasn't being broken, it was taking a weekly break from control. During the week, he was a big time attorney. Always on point, always in control so the reasons vary but yes, hurting people are drawn like flies.
One of the worst parts of this is that for every solid, responsible Dom/me there are hundreds of power hungry people who don't give a flying fuck about who the sub is nor where they come from. They will push hard lines. They will flippantly work over someone who is truly sick. They will do disgusting things that cross into just wrong.
As for helping or breaking further...this is tricky. I think someone trying to understand the abuse they suffered as a child (for example) by delving into BDSM with a solid Dom/me who understands aftercare and where the person is coming from might actually find so,e real release to pent up pain but this would have to be handled so carefully.
In lesser experienced hands or in the hands of one of the millions of fools, utter disaster.
As for trying at home with a child sexual abuse survivor? I wouldn't touch that with a ten foot pole.
You don't want your partner aligning feelings for you with her abusers for any reason. I strongly feel that kink play that involves pain, bondage, flogging or anything similar at home is for healthy people with strong boundaries and a strong relationship.
I hope that helps. I'm not a sex therapist but I play one on TV.
Okay, just kidding but I do have quite a bit of experience and observation in this subject matter.