We don't mass delete posts nor is it acceptable for members to do so. Editing is fine but only to remove very pertinent identifying info from posts that are serious privacy or security concerns. If you are found to be mass deleteing posts rather than editing them to remove the concerning information then you may lose your ability to edit entirely. You can send me a list of specific posts you want edited and I'll take a look.
Older posts may have a permanent lock on them that can only be lifted by an administrator. If you have an urgent privacy issue that necessitates an edit of an older post you can contact me by PM to link me to the post and I can make the edit for you.