This is a public internet forum. When you post something here, after our generous window of 12 hours for you to edit or delete, it becomes part of the board. We leave threads as they stand for the benefit of anyone who may need help on a similar topic in the future. Being that this board is primarily a place for getting advice and feedback, it just wouldn't make sense to delete threads after so many people contributed to them and offered their time and effort to help someone. They become a rich resource for others.
As with all public spaces, it is the responsibility of each person who joins here to take precautions to protect themselves. Keep in mind that, whenever you post on the internet, generally, the material you post no longer belongs to you. This forum is searchable by Google and other search engines. So, it is your own responsibility to ensure your safety by not including identifying information. For example, if you do not want to "out" yourself as poly, you use aliases in your posts and don't reveal too much detailed personal information. We can't do that for anyone; it is up the each member to do that for themselves. The only place we can be more proactive about protecting posters is in the Blogs forum, where we can delete offensive posts at a blogger's request.
I hope this is helpful.