The predators who exploit kink to abuse – and the women calling them out

 https://thefetishistas.com/predators-who-exploit-kink/

"In 2012, the term ‘missing stairs’(2) was coined to describe such people by Cliff Pervocracy for his blog The Pervocracy, in a post discussing dangerous people in kink.

‘The missing stair’ is his metaphor for a dangerous person known to a community, which chooses to quietly warn individuals of the danger instead of deeming the problem unacceptable and fixing it."