it would be nice to have the counter-counterargument, "Unlike this bad person here, we have a policy of deleting posts which claim Q->specific-violence even if the post claims not to believe in Q because the identifiable target would have a reasonable complaint of being threatened".

I would find this counter-counter-argument extremely uncompelling if made by an opponent. Suppose you read someone's blog who made statements which could be interpreted as vaguely anti-Semitic, but it could go either way. Now suppose someone in the comments of that blog post replied by saying "Yeah, you're totally right, we should kill all the Jews!".

Which type of response from the blog owner do you think would be more likely to convince you that he was not actually an anti-Semite: 1) deleting the comment, covering up its existence, and never speaking of it, or 2) Leaving the comment in place, and refuting it - carefully laying out why the commenter is wrong.

I know that I for one would find the latter response much more convincing of the author's benign intent.

Note: in order to post this comment, despite it being, IMHO entirely on-point and important to the conversation, I had to take a 5 point karma hit.... due to the LAST poorly thought out, dictatorially imposed, consensus-defying policy change.