Some of the most toxic people here are regulars. But they use ungoogleable pseudonyms as their usernames, which suggests that they have some shame. My thinking is that if people know that a google search will bring up their LWN rants for future employers, etc. they might think twice.
But really, I'm thinking that the potential role of the LWN comment section should be a professional discussion forum for our industry. If nothing else, using real names helps set the tone, and emphasizes the idea that isn't just another internet grandstanding platform.