I find it amusing how f-man doesn't even need to say what he means by "both."
Anyhow, yeah, there's no real point to permanently banning them from the entire site, both since they aren't really horrible to the point of justifying it and because I don't really want to deny them the opportunity to time attack anyway. But on looking at the list of most frequent posters, I'm pretty sure I've heard negative comments about their posting from close to all of them, and... well...
Is it really that hard to not lash out all the time? Joking or not, nobody likes it.