There's a feedback loop, regardless of whether we find the communities virtuous or not. It's not difficult to see how, for instance, the boardgamegeek forums helped turn a very niche strategy hobby into something that has a nice sized shelf at Target, with a market over a hundred times larger than 20 years ago. You still needed people that could enjoy such social pastimes, and different societal changes will have an effect of how many people are even interested in such things, but the meeting ground sure makes a difference, as it reinforces the interest, and makes it easier for people to dive deeper on it. It just happens to be something that we consider harmless, or even positive.
o while there sure are more desperate people that have antisocial tendencies, just for economic issues, whether they consider those tendencies to be socially acceptable, and whether delving more on them is something that they will do, depends on finding social validation, and nowadays, we do that on the internet pretty easily. This kind of thing could still happen in the past: History tells us so, but the level of disengagement, and depth of the economic reasons required to trigger the radicalization of people, in one form or another, is far lower than before. It doesn't matter if it's people finding support and advice on how to kill themselves, bulimics seeing that their behavior is normal, or just a teenager that finds other people that likes music from the 50s, or goes very deep into pinball. Similar shapes, except some have deadly consequences.