I, too, can claim to have plenty of experience with BDSM clubs (as I did in my post!). However, that does not change the fact that there is no basis that dungeon goers are safer than non-dungeon goers.
Thir-- I was simply reversing the logic of the OP. By claiming that non-dungeon goers are more safe, I illustrated that there are no grounds that one group is more or less safe than the other. This was meant to parallel the OP's claim. Both assumptions are wrong, or at least too easily presumed.