Here they go with their complete lack of understanding. Sure abuse occurs in the bdsm world, after all it involves humans, those same humans who abuse each other behind closed doors in plenty of other places.
A lot of people live in perfectly vanilla, extremely abusive relationships all over the world. Bdsm just gives the moral police something to point at.
The bit I love is.... Yes I flog my wife, I cane my wife on occasion too, restrain her with rope and tease her until she begs for release. Every single time she is perfectly willing and happy to submit herself to all of those things. She is perfectly happy and free to choose within the bounds of our agreement, at all times she has choice. She couldn't be in a more supporting, loving relationship and neither of us are mentally unstable or emotionally broken. I wonder how many of the moral police can say the same. I bet there are those that can't. Just like every other walk of life.
Don't judge others with your own insecurities...