This ain't trolling
If you don't feed the troll they tend to die off from starvation
Except these aren't trolls and aren't trolling. They are horrible, hateful, spiteful bastards who are really trying to cause people grief and delight when they achieve that. It is not just a case of casual commentary or abuse in jest; these are targeted, persistent and determined campaigns with intent to make people's lives a misery.
Bullies, plain and simple. And they won't stop until they are harmed themselves through being exposed or shamed, forced to confront the harm they cause, or punished for that.
We wouldn't put up with such bullying at work, at home, or in our social lives, so why should we have to put up with it online or see it facilitated through the security of anonymity?
We seem to have increasingly adopted a more American ideology of 'free speech' online where almost anything goes and almost everything has to be tolerated in its name. That is however incompatible with free speech within British culture which is far less tolerant of hate speech and that which causes harm. We have ended up with traditional limits of acceptability being stepped beyond with impunity and we urgently need to rectify that.
That is not be against free speech - these people are already infringing AUPs and site rules - it is just that we do not have effective means to deal with those who do step over the mark with service providers also slow or reluctant to take action.