I often find myself somewhat curious about psychology of internet commenters. I think most of them can boil down to just wanting to be heard and feeling powerless because that’s something most people can identify with. I’ve often seen horrible commenters who instantly become apologetic and meek once they find out someone is actually listening to them. Some are just horrible trolls to be sure, but I think most just want attention, to feel like they matter and to belong.
Also I know that all internet commenters aren’t young insecure kids, but man reading some comments makes me enjoy my 30s like crazy. Confidence is a really really hard thing to gain and not caring what others think is at least as hard. I don’t think it’s possible to be 100% confident or to not care, but I’m definitely better off now than I used to be.