A small point of protocol
Won't comment on whether I agree or disagree with your opinions, but I believe it to be bad form to take a shot at someone who has "left the building" so to speak, and can't respond.
Same goes for anyone who's been banned. The latter is worse, because even if they're lurking they don't even have the option of responding.
To be sure, it's not any kind of official rule, but it's one of mine.