I agree. I do have to call the police on a regular basis, with aggressive or violent people; if I got groped at a con, I'd call the law.

At present, 'he might be nasty to me' is not, however, grounds for summoning the cops. I feel very patronised by a lot of the current debate over safe spaces: it is not a model by which I operate, but it is a model which is becoming increasingly applied.