Doc, I understand that it wasn't an optimum outcome to a FS thread....However, given that, here's my take:
You (and others, not singling out you) placed an ad in a Marketplace Forum. By the very definition of 'Forum' its use is for discussion. Good or bad. Your MB was getting called out some for not being a High End restoration and there was a sub-discussion going on as to the term HE and how it got confused with Jim McCune's work. But it wasn't ugly or offensive or against the TOS so it should not have been deleted, or even closed at that point.
If you don't want a marketplace ad to have open discussion, then place an ad in the Marketplace (non-forum) where no discussion takes place. But if you place it in the FORUM, then expect discussion good and bad. Maybe Robin will chime in and give his take. If the Marketplace FORUM needs additional rules and regulations, then so be it, but it needs to be removed from the general forum collection area, IMHO.
Again, doc, not singling you out and you didn't do anything wrong. Just voicing some frustration over the recent turn of pinside's moderation and censorship.