You are assuming that perfect and fair governance is a reasonably achievable state. Reality begs to differ. In reality, there are people in the USA who are in the closet or of fear of persecution by their communities.

Privacy provides a fundemental protection from persecution by your government. This is precisely why the constitution includes specific privacy protections.

So while we should fight governments that persecute homosexuality, we also need to protect at least some aspects of privacy to keep protections for the next persecuted group.