setanta -- Some of those trolls are sock puppets created by people who are having a bad day and who assume an identity, go one a2k for a weekend and blow off steam by picking on a poster -- in this case, you -- then disappear as that incarnation.
You're wrong about that. The people i ignore have been members here for yeas, and continue to post. Drive-by trolls are not a problem. The long term trolls are not a problem, really, either--but they can bother other people. One of the idiots i consistently ignore has been more or less stalking me lately. I know this both because busybodies around here send me PMs to ask if i have read so-and-so's latest remarks about me, and because i can see the user name as the last person posting in a thread, immediately after i have posted. I still ignore that peson, by the simple expedient of not reading their idiocy. But it can still cause annoyance for other members, and sometimes even for me. Our newest troll in training apparently made a snotty remark about me, because another member said that if he and i wanted to mud wrestle, we should take it somewhere else. Goddamn it, i don't read the little ****'s posts, so leave me out of it. I almost posted that, but realized that this member doesn't know that, so i refrained. But if she pulls that **** again, i'm going to tell her that i don't read that idiots posts, and to leave me out of it.
This idiot has the dubious distinction of being here for the shortest period of time of any member i have decided to stop reading.