No approval-no disapproval policies are just disapproval with extra steps.
Yes S&M practises can be dangerous, so can vanilla straight sex, or bungee jumping or alcohol or weed.
Individuals don't always make the best choices for themselves or others but by framing that as intrinsically the fault of S&M you're moralizing an amoral activity and painting with broad strokes over the numerous well documented safe and consensual practices
Sadism also comes with mental health risks one of which is "dom drop", a feeling of guilt after a scene for hurting someone they care about, doms need aftercare just as much as subs
Some of your arguments sound similar to arguments of "cultural degeneration" that sexual deviants are becoming too unashamed and their inherently harmful practices are leaking out into "polite society"
Either S&M is fundamentally abusive in which case we should oppose it unambiguously, or it is not intrinsically abusive and the problems you're talking about have a deeper root cause that we should focus on rather than villainising people practicing safe and consensual sex
#SexPositivity #Sadomasochism #Erotic #Kink