These small factions of complete assholes put a stain on encryption technologies that governments like to point out. I still think that everyone should have easy access to high quality encryption. While it can be enabling for groups like this, the nanny state alternative we continue to move towards is ultimately worse.
That implies law enforcement will investigate right wing extremists, which they often don't because they're a part of that whole thing. Loads of LEOs give their buddies insider info to avoid being flagged.