I'm uncomfortable with arguments that are equivalent to PerceivedBenefit(X)>RealBenefit(X) and RealBenefit(X)>0 but NegativeBenefit(Actions|PerceivedBenefit(X))>RealBenefit(X) so X should be banned.

Since PerceivedBenefit(X) and Actions will both vary by individual and are controllable through learning and discipline, I'd rather give individuals the right to choose.

Equivalent examples: Seatbelts are bad since people will drive recklessly; calculators are bad since people won't bother learning arithmetic; cars are bad since people will walk less. In each case, the negative does occur. I'd argue that as a whole society is better for all of those.