I mean, I kind of understand: The discussion is going to turn into the kind of thing that HN tries to avoid. And yet, "moralities" driving things we can't talk about is the point of the essay, so it's really ironic to have it flag killed here.
Off topic: We used to be able to vouch for flagged posts, and we can't seem to do that any more. That means that flag killing is uncorrectable - if users decide that it's inappropriate, their only recourse is to email dang. That seems to me to be a step backward - let the user base correct the overreach of others in the user base.