It's partially because articles like this draw a large number of zero-effort comments like "rules for thee and not for me" (which already appears five times her

It's partially because articles like this draw a large number of zero-effort comments like "rules for thee and not for me" (which already appears five times here), which makes it easier for the psychopaths to feel comfortable enough to comment. I always take a run through these comment threads and flag every one of these that I see, as they clearly break the HN guidelines. If other people start to do that too, then violent comments like the above will also become less common.