The point of blockchains is decentralization, and as Lemmy users we know that decentralized services are difficult to make popular, even if they’re an improvement over their competitors.
If you believe something as common as this is sufficient to diagnose a mental disorder, you might’ve been misdiagnosed (or your diagnosis was explained insufficiently).
Do you see instances who’s main purpose is to represent “people inside the more mainstream American Overton window of mid right to far right” that are even nearly as popular as Hexbear?
If you’re browsing all you frequently see posts from Hexbear users. I’m yet to come across a noticable amount of posts from users from an instance which represent the group you mentioned.
(I couldn’t even name a single instance that fits that description, because if they exist, they’re not nearly as active as Hexbear.)
Toxic people exist on all public instances. But on some they’re more common than on others.
The issue with Hexbear is that their users tend to talk in a very demeaning and insulting manner. About half of the popular posts on Hexbear are about making fun of people or communities. Their political views are less of an issue; it’s more about their toxic behaviour.