You don't respect the views, fine. You look down on anyone who can hold such views, reasonable. But regardless of that, in my view, there is a duty to behave towards the person, as reflected in any communication with them, respectfully, which overides such feelings. Feelings just don't come into it.

I recognise that this is not how we are likely to behave, but I believe it is the standard towards which we should aim.

The trouble is, online abuse, however justiafied it can sometimes feel, is something which can easily build into something pretty damaging. I think there are rare occasions when it can indeed have a place, but they are as rare as the situations when a blow to the face is the right response.