Sorry to dig up old bones but I must somehow have missed this thread after about the first 4 posts.
It seems to me a bad idea to allow this type of deletion. I would like to see deleted posts show hidden, but still give users the option to view them, as some other forums do.
Kind of like this:
Deleted Post
This is a post with content that has been deleted by the contributor. It is collapsed but still available to view.
This would force users wanting to destroy posts, to manually edit/remove the relevant text first (maintaining the required minimum characters).
It would also be nice to have rules limiting the amount of deletions, with new posts being required before additional deletion rights would be granted. I understand the necessity of allowing deletions and editing, but this type of mass deletion should be made even more difficult.