You didn't say it explicitly, but I believe trolling does include a strong orientation toward justice and punishment. This isn't incompatible with empathy, but

You didn't say it explicitly, but I believe trolling does include a strong orientation toward justice and punishment. This isn't incompatible with empathy, but having empathy will change how the troll operates. There are definitely cowardly and sadistic trolls, but that's because Sturgeon's Law applies, 90% of everything is crap, including trolls, being abusive is the only tool in their toolbox. I'm making an assumption here, that some form of trolling is "good", but I'm ok with that. Throughout history some of the best writers trolled the shit out of their ideological opponents for the greater good without being anonymous or sadistic. Jonathan Swift, Sam Clemens, Socrates, etc.