I admit I was a bit surprised, as well.
We are not new to forum commenters, but this was still new to me.
Until I saw how many of the worst comments are by "new members," or by those who post only on this game, and not anything else.
So, my guess is that:
1) Some of them are old commenters who are too ashamed - even while anonymous - to say shit that is easy to see are lies. Like those who claim to have played the game and finding NTR in it - while complaining there is no sex in it, as well. Now, I know that many people here like defining NTR as they see fit (and wrongly), but I think having sex is a pre-requisite of any definition.
So, they run off and create a new user so they can shit on.
2) Some want to have people agreeing with them, so they create new users and then have those liking their posts, having conversations with them and so on.
It's easy to find those, by the way, since you see a "new member" liking another "new member" and then commenting on how the first "new member" is right.
Nothing we haven't seen in other places, but dangerously pathological.
3) Some are simply jealous - especially the one who was frustrated that this game actually makes 500-800 dollars, and started calling me names.
4) Some are professional haters - they hate anything that isn't exactly themselves. Lacking that, they would eat their own faces, so I'm glad me and others here are providing them an escape from their miserable existence.
5) Some genuinely hate my game. And have very extreme views about it. And need some change to their medication.