If you are within the 4 hour limit to edit a thread, even if you cannot delete it, you can remove what you posted and ask that the thread be deleted instead...then report the thread with your request.
This is the internet, people can read from outside the site. They cannot post unless they join. It is incumbent upon the members to be aware of what they are posting. Sometimes things are posted and you do have second thoughts....very normal for that to happen. That is why there is a 4 hour period in case you change your mind. Remember that the team members are volunteers and are here whenever they can give of their time. Some do not have access to ALL forums and cannot do things in those forums that they do not mod in. We get to things as quickly as we can!