But, sadly, I know you're absolutely right re the existence of trolls which would make a point of using that to create suffering. Not just to get a reaction, but some would do it specifically to have a world they could torment beings.

My model is not that all those trolls are identical (In that I've seen some that will explicitly unambiguously draw the line and recognize that egging on suicidal people is something that One Does Not Do, but I also know (seen) that all too many gleefully do do that.)

It's worth noting that private torture chambers seem different to trolling, but a troll can still set up a torture chamber - they just care about people's reaction to it, not the torture itself.