While I understand that the public way want to know a number of things about certain individuals, I think that we should keep in mind an individuals privacy and how it should be respected. I don't think that we should have the ability to force someone to give up information.
Transparency is something expected of government, and people running for government office, and maybe those in positions of power. While we would like to see more transparency among leaders, this is not their obligation, just as the public is not obligated to accept their lack of transparency. Only for those who have committed serious crimes should there be an exception to this rule. The public has little, if any, right to know in regards to individual privacy.