I think there is confusion here about cause and effect, especially in veronika's posts.
Sexual abuse histories do seem to be disproportionally present among submissives.
After much thought, about both my experiences and others though, i don't think that submissives are drawn to BDSM because of past abuse.
i think it is far more likely that abusers are drawn to submissives, especially as children, because our inherent need to please can make us very easy to victimise.