The main issue with permanent karma is that it's very possible to grief others by baiting them into losing karma.
The worse issue is that unless you actually deal damage to someone, it's impossible to prove without a demo. Even if a damagelog shows someone shooting you once, it could easily be argued that it was an accident and you overreacted. The reverse is also true. If you accidentally shoot someone and they kill you, they could compile instances of this and claim that you baited them, in which case you're royally fucked. The two events are nearly indistinguishable and unpunishable unless:
- Someone baits an admin/VIP, which is extremely unlikely
- Through whatever circumstances, an admin/VIP has been dead the entire round and managed to see the other person baiting someone
In situations where it's very, very plausible that someone would miss repeatedly before killing someone (for example, sniping from the bottom house on crummycradle, or any far distance for that matter) it's incredibly easy to bait someone into losing 400+ karma, and even easier to get away with.
My point is that if you're choosing to ignore this problem after an entire thread, you're kind of an asshole and I have nothing more to say here.