I don't see why posts that are deleted are just.. gone!! I don't even have a record of the comments I made in them in my user profile.
For example, Free Delivery on Purchase of Apple Polishing Cloth posted yesterday. Yes it's dumb af, and no it shouldn't appear in search or in the list of deals, and no I shouldn't be able to keep making comments after a mod 'locks' it. But I don't think there's a good reason to stop people who know the URL (from their browser history) to view the discussion post-nuke.