Uh... no, dude. There must be a few hundred handles here that made maybe one post half a year ago and then dissapeared entirely. If they're not using 'em, they won't miss 'em. Assuming they ever even come back to view threads, which they just plain don't. They gone, ese. They long gone, and deleting their handles wouldn't be killing anything at all, since nobody's home.
Also, the whole slippery slope to forum fascism thing has to be the lamest argument I've heard all month. You can't just compare every ****ing thing to Hitler and assume that makes you right, dude.
On the other hand, if I was an admin, I couldn't be bothered to eliminate all those names, and the admins are, if anything, even lazier than me- hence, it'll never happen.