From what I've seen, trolling is about power. Trolls act to make a mark on people similar to how graffiti artists make their mark on blank spaces. If you suspe

From what I've seen, trolling is about power. Trolls act to make a mark on people similar to how graffiti artists make their mark on blank spaces. If you suspect somebody is a troll, you shouldn't call them out on it. Trolling is about intent, and unless you're a mind-reader, nobody knows that but the troll themselves. Trolls are not legitimate contributors to a conversation. You gain no information from them, so it's not worth engaging them. Suppress your desire to "correct" them, and suppress the urge to publicly inform the troll's victims that they are a troll. That's exactly what they're after. I could be missing some subtleties, but these seem like the running themes.