I think some of the people here are biased. Me too.
A catch-all is needed because of the evolving tactics that aren't desirable. Even if we found some broad way to address most or all of them, I'd expect people to find a way around that. I would prefer the rule to be something like 'Do not consistently act in a way that harms the ongoing fun of another player' It's still massively subjective, because I could say that newb is bored of you killing him, and you could say he's not bored, or he's getting used to it, or he's a pansy. But the rule has a clear objective - everyone deserves to have fun, simply because they are here.