As a compromise I suggested to @Sneak to just allow Authors to collapse replies they don't like (hidden like when they get downvoted) but not have them completely deleted from the thread.
Unfortunately Sneak insists he wants the moderated comments to disappear and with no trace on the website. I believe readers should at least be informed a "comment was hidden by the author" and be able to see the unmoderated content if they choose without having to open blockexplorers or leaving the site.
https://steemit.com/steemfest/@timcliff/dinner-with-timcliff-and-sneak-at-steemfest-discussion-about-communities#@lavater/re-timcliff-dinner-with-timcliff-and-sneak-at-steemfest-discussion-about-communities-20171110t054335347z