Let's think about it, what reason are there to autistically care about wether people do lewd things online? What other adults do with each other in a consenting manner.
Jealousy? Good chance, lashing out angrily while you are to socially awkward to ask anyone or other mental issues. If someone wants to they can find someone to ERP with every day.
Anger at being hurt by someone and never letting go of it? Also a good guess, would explain why some posters here are so obsessed with certain people.
Frustration with yourself? Wouldn't be the first time someone hates themself and lets it out on others, cause it's easier than to accept it and deal with it.

Like usual for 4chan, it's always nerds complaining about nerds cause noone else cares. And here it's lewders complain about lewders. With their trust issues. With their social awkwardness. Their jealousy. And their impotent anger.
And all those bad feelings will never go away as long as one rams their head autistically against it. Half of it is even stuff from more of a year ago, cause that person hasn't met the other since that long since noone likes them and they can't join the meetup. Letting someone live rent free in your head and all you can do is shit up the thread.