You've only made one topic on setting up a Nursing business? I see nothing contentious or strange about it. It is pretty standard on internet forums to treat all posts as permanent. I think mainly because other people contribute their knowledge and opinions and it's a bit of a slap in the face to remove things, edit them or sometimes ask forum admin to remove the topics. Certainly the forums I moderate we only ever remove a topic if litigious or something mega serious has happened.
Otherwise, you stand by what you write. If you wish to leave a forum, you simply don't return and stop posting. I've posted plenty that with hindsight, was a bit daft - BUT - I certainly wouldn't ask for them to be removed!