I'm convinced 99% of fatties in the kink scene are only there to be punching bags for actual people. I know looking at that ugly bag of lard makes me want to punch something.  That's an interesting theory... but do you really want any of your toys (not to mention you) to come into contact with that ass, especially considering they're into bloodplay? If I want to get my anger out, I'll punch a bag or pillow or even a wall. BDSM is a way for me to have some fun, get (more) horny and usually ends in PIV or A sex.