Does this apply to a phone call? To a zoom call with five people in it? Should trying to stop someone from doing something, even if abhorrent, in private, really be a priority? I can only see this ending badly. If there is a link to real world crimes, sure, intercepting a discussion is one method available to detect / deter / deny / disrupt, just like a wiretap. But (and maybe I misunderstand your comment) beginning with the idea that we should try and prevent conversations we find abhorrent from happening is, well, abhorrent.