Why don't celebrities we know are gay come out of the closet?

For instance, Jodie Foster and Queen Latifah. I don’t see how coming out could hurt these two women (others, like those in sports, Tom Cruise, or Ricky Martin might have difficulties). They are both so established, but refuse to say, either way, if they are gay or not. Jodie Foster has had a relationship with a woman for almost 9 years, and they have a child together, why not just say “hey, I’m a big ol’ dyke”?

I ask because, we all know that exposure to people of the LGBT community leads to greater social acceptance. Why wouldn’t these celebrities do their part to further LGBT rights?