I wonder if there is a way to purge them, maybe the something that makes you vomit or something, but probably not as they were not meant to be anything more than a death trap of sorts I would imagine. But some thief figures a way to abuse them. Good for him for originality, and poisoners seem to be crap anyway so I doubt the Imms find it a problem that people complain because some thief found a way to kill them. Every class has something everyone says is OP.

Warrior - bash is op, Assassin- assassinate is op, Bard - Fiend is op, Necro - PWK is op, Transmuter - duo/neuro is op, Shifter- flyto is op, Druid- the hunt is op, Paladin- wrath is op, Anti paladin - Cleave is op, Shamans - rot is op, Rangers - snare is op, Invoker- every spell is op, Rager- deathblow is op, Outlander- insects are op, Empire - russians are op (sorry, just had to put that in cause I see complaints when I read the forums, nothing more than humor I assure you).... Point is you can find people bitching about everything that kills them. Basically only non over powered class is a healer. But they make any other class over powered against any solo character so they are op too. (Lich/mummy excluded perhaps)

Thieves are generally griefing characters (intended or not they all seem to do it- stealing people's things is really just crappage.) that bring little to the game just because that is exactly what a thief is as I see it. They sit in shadows and seldom come out. They blackjack and steal inventories and then call others cause they can't win a normal fight. They are in a sense the jackasses of Cf because they are really nothing more than a class built on annoying others. But then you realize, real life is full of jack asses and people who do nothing but annoy others and are opportunistice little bastards that can't do crap for themselves but can only take advantage of others. So CF, in having a real atmosphere, has the thief class. You deal with it, you get pissed, you move on and be happy knowing most of them delete after 50 hours cause they get bored playing that type of character that has no rp and no real point outside of annoying others.