Well, among other reasons, because excessive incivility and outright slander when you are accusing people of incivility and slander kind of makes it hard to take you seriously.
But then again, its also kind of a repeated pattern with Zed and communities he has been involved in, so its not all that surprising. (Which, again, might be a speaker-specific reason to avoid it; instead of attracting attention to the subsequent message, it might be dismissed as "oh, so its HN's turn now, big surprise".)
Well, among other reasons, because excessive incivility and outright slander when you are accusing people of incivility and slander kind of makes it hard to take you seriously.
But then again, its also kind of a repeated pattern with Zed and communities he has been involved in, so its not all that surprising. (Which, again, might be a speaker-specific reason to avoid it; instead of attracting attention to the subsequent message, it might be dismissed as "oh, so its HN's turn now, big surprise".)