The thing is, I don't see anyone on this thread saying that BDSM IS a feminist choice. Just that choosing to partake in it is not necessarily unfeminist.
The bottom line as I see it is that violence against women is appalling. Some men are hiding behind BDSM as a way to abuse women. Sometimes, these men injure and kill women and, due to police misconceptions about BDSM/consent to assault, the full weight of the law is not being brought to bear upon these men.
That situation is completely crap. Women would benefit as a whole from people in the BDSM community saying "not in my name" and increasing awareness of consent within BDSM relationships so that these women DO get justice.
So when those of us who DO partake in BDSM come out and say "no, these men are abusive bastards, that isn't what BDSM is", how much does it help to raise awareness if people NOT into BDSM say "no, but BDSM is just about violence".
It actually reinforces the ability of men to use BDSM as a defence.
Plus, it is only a short hop from "BDSM is violent" to "well you knew what you were getting into".....which is a bit too close to victim blaming for my liking.
People into BDSM who do say "not in my name" won't speak out if they are told they are non feminist, reinforcing the patriarchy, and that their descriptions are "boring". Descriptions given as a means of demonstrating that these murdered women could have wholeheartedly entered into BDSM with their murderers, and it STILL wouldn't explain the violence towards them. And therefore police and judiciary should understand this and stop letting these monsters claim BDSM as some kind of defence.
So I am forced to conclude that actually, some people are more bothered about condemning BDSM, than practically helping these women to obtain justice.