Revealing Bloggers' Identities

There's an unwritten rule - well, maybe it is written somewhere - that the worst thing one can do is to expose the identity of a blogger or commenter. You may know it, you may share that knowledge with others, and you may even tell him you know who he is, but never, ever, ever, announce that online. The reason given is that it kills the whole concept of blogging. If a blogger/commenter knows that his identity will be plastered all over the internet for all see he'd never write in the first place. Obviously, those that use their real name have no qualms about being identified or harassed for their opinions, but we don't speak of them, we speak of those that don't wish to make all their views known, for whatever reason. I'm somewhere in the middle when it comes to my identity; I don't mind if those that know me know that I publish Circus Tent, but it's those whom I don't know, those that send nasty anonymous e-mails that worry me. I'm also uncomfortable with people knowing me and sending me nasty e-mails and messages, yet I have no clue who they are. One of the non-perks (for lack of a better term) of blogging is that so-called friends stab you in the back. They're jealous for some reason and shoot their mouths off to that effect.

Which leads me to my current problem. After some research, and some Holmesian methods of deduction, I believe - with the help of a friend - I've stumbled across the identity of a certain commenter here. He may not be known to some of you, but he's been sending me nasty e-mails making claims that I KNOW he has NO knowledge of. The idea, I guess, is to intimidate me, and stop from from writing about certain issues in the news, as if what I write will affect the issue somehow. He seems to be somebody I know, and he's been stupid enough to drop hints as to his identity, lucky for me. I never bother to find out people's identity, simply because I have neither the time nor the patience for it, not to mention the knowledge to track an IP address. Also, if I start doing that I'll surely lose readers, even as it is it's difficult to get comment writers to use fictitious names when commenting, all they do is use "anonymous." Imagine what will happen when they find out I track their computer usage. So, my question is: do I approach this character and tell him to cut it out immediately, or is that taking it too far, seeing that he too can take retribution and announce my name to all?

Your input is appreciated, and I mean all of you.