I've been using the Internet, IRC etc since I was about 8. Not until I was about 21 did I ever use my real name, address etc.
You state the guy is "mentally ill", but can't the same be said of you if you're retaliating? It's just the same thing, really!
True we were both complete idiots for doing this but the guy definitely has a tinge of paranoia and insanity as to this day he's still phoning around looking for me. He's also 20yrs older. My lame antics can be excused for being underage, him not so much
I always wonder whether I'm just strange -- I don't really have a good reason to hide like this, I just like my privacy -- but as soon as I saw this story, it reassured me that I'm doing the right thing.