I don't think anyone would give you an argument on most of that.
I would argue that I think "mental health issues" are thrown around far too easily. Imo, some people are just nasty, bored, jealous, whatever and are hitting out. I also think some have perfectly sane, if very unpleasant, actual motives.
I suspect some are bots.
Do you think trolls aren't "called out"?
What can the average poster on MN do? You mustn't troll hunt, so you can report posts - sometimes they'll be removed, sometimes not.
Afaics, it's rare people are banned. And if one is cut down, it seems several may spring up in their place.
I appreciate you say you know very little about social media. Nor do I - I only post here.
But even so, I've thought exactly what your post says and so has practically everyone who posts anywhere on SM, I should think.
Are you really so naive as to think that's a new opinion?
And, if there has to be a sudden stand made against trolls in some new way, is the lady being treated for cancer the right one to do it?
Or, with hindsight, should she have always done her job in jeans and trainers, no make-up and unwashed hair so that if she ever became ill she could crack on still?
The trolls would have been silenced then, would they?