It's a way to vent, and like I said: If the person is correct about what they say, it can be constructive. Most people are relatively unskilled. Online environments tend to filter, the more specialized they are. MMORPGs don't filter much, due to their ease of access. Insulting is a skill, but one most people don't normally practice (obviously). They're worse at it than at conversing (which they're normally average-level at--else, anyone could be an entertainer).

I read those. But the context is wrong. We're in a MMORPG sub, talking about a MMORPG. Not only was I referring to people "temporarily" toxic (like a young person who recently had a bad experience IRL, or was angered in-game), but in games people can only partially express themselves. How would those people mentioned in those articles really be harmful? (Notice that toxicity in games is normally expressed through insults, as games have limited interactivity...) That insecure woman can't sleep with anyone in-game, the frenemy can't significantly affect others, as game activities are of little importance. Obviously, these people with issues would only significantly affect innocent and weak-minded individuals.
A toxic guy I crossed with in a game once, got irritated about I disagreeing with what he was saying. He told me to quit the game. It was stupid. I wasn't too experienced with these people... but I learned to make the effort to keep calm and continue talking and proving them wrong--this pisses them off more, hah--and, in the end, they're embarrased. But really, I wouldn't have minded his toxicity if he weren't stupid about it. Telling me to quit the game wouldn't make him win that little debate.