I appreciate the question but a private forum already exists and from what I'm told it's pretty quiet in there. Anybody who claims to be TS yet worries about being "outed" has a rude awakening on the way, and if you are worried about being tagged as TS because you post on a TS forum than the answer seems pretty simple to me. (and it AIN'T to restrict the forum to others in order to protect your own privacy)
I have zero interest in something like Safe Haven. Who wants to preach to the choir? Who wants to limit themselves to a captive audience? I want EVERYBODY to read my posts and I want them to engage me in discussion if they disagree. This forum would be FAR less interesting if the audience were limited to members only.