Posts do not get deleted (known as reaping) from PM but for exceptional reasons (duplicate post, blatant trolling, spam, and things of that nature). Even then, it is not truly deleted, but only marked as reaped, and viewable by those with the proper user settings.

PM uses the theory that my learning process can help someone else as well, so things don't get deleted. A user blanking out their post even generates a request of the janitors for a content restore.

Welcome to the monastery.