Earlier quoted context omitted.
We don't have (or, really, want) to prevent the use of quasi-anonymous logins. All we need is to make life more miserable to trolls than they make it for everyone else. With enough frustration, trolls will gravitate towards places where they can sublimate their frustrations more easily and, hopefully, leave HN for those who really want to engage in civil conversation.
I suppose that would work for some trolls. Then again, trolls here tend to have advanced degrees in Computer Science, so might be more difficult to keep them out. PS - No, I'm not alleging that I have an advanced degree in CS. Nor am I denying it.
I do have a CS degree, but I must have missed those classes.