This is wrong on so many levels. Yes, anonymity gives people a wider range of expression and some use it badly. Did she stop to consider those that use it for good? Say goodbye to comments such as "I work for the government and I see so much waste everyday" or "I'm secretly gay, and here are some reasons why I don't feel safe coming out". We might as well ban driving because there was a horrific accident in London last month.
While a threat doesn't actually do any harm to a person, it does ruin discourse.
Reason being that some people are more sensitive than others, and will not post things that they feel are controversial or personal since they feel they'll be challenged or threatened for it. Even if those threats are completely bunk and amount to nothing but trolling, the chilling effect on discourse is still there.
That's the way to solve that issue.
And if using a threaded system like HN,/.,Reddit, etc, if the threatening post is the only response to a comment, downmodding it doesn't accomplish anything.
If you received a death threat on hacker news that listed your full name, and your kids' school addresses, wouldn't that give you a panic attack? I'd call that harm without a doubt.
because of the possibility that personally identifying information might be revealed, anonymity should be forbidden? eh?