Some of us might have worked for corporations or government organizations in which just about everything was considered confidential. There was even a rubber stamp to blast that message.
Then there was a paradigm shift. Secrecy is considered verboten, at least for thought leadership. You may agree with that or not. But currently that's the prerequisite for trust.
A skillful politician, Hillary Clinton nevertheless has made a serious mistake. She wrongly assessed her legal right and power to keep her communications as U.S. Secretary of State out of the public domain. As the world now knows, she used her personal email address. Such a lack of openness could, as the crude saying goes, "finish her."
For thought leaders, your priority has to be transparency. If you are unwilling to align with that value, then you can't take on that public mission. Run a hedge fund or a private company.