Exactly. The troll is someone who notices someone who is vulnerable and triggers them. I do wonder though if there isn't more than a little reinforcement betw

Exactly. The troll is someone who notices someone who is vulnerable and triggers them. I do wonder though if there isn't more than a little reinforcement between the groups. Someone with BPD leaning behavior doesn't need someone giving a push to keep their emotional roller coaster going but someone provoking them can't help. And, of course, trolls are in it for the reaction and the least well adjusted people give a rather strong reaction.