The problem is not with trolling per se (there is troll-like behaviour IRL, and we have learned to deal with it appropriately) but with scale and amplification

The problem is not with trolling per se (there is troll-like behaviour IRL, and we have learned to deal with it appropriately) but with scale and amplification of trolling by that oligopoly of a small handful of social platforms serving millions of locked-in users each with tailored content that their algorithms consider “engaging” for this particular person. Big Social is in symbiosis with trolls and profits by giving them platform, and I suspect this will remain so for as long as their business model has the advertisers as primary paying customers and main source of revenue. That said, targeted persistent trolling (I prefer to call it bullying though) is horrible, and I’m sure there are extreme cases where jail may actually be warranted.