yeah it's there, so what? it's not a secret, it's not meant to be a secret. the documents detailing your health as you were born are supposed to be confidential, not the fact that you were born with a dick.
and there's countries that have citizens who have lived for generations there but don't have any id, number or even official citizenship to act as a citizen and without the usual human rights to boot.
I don't see what's so great about that.
having an unique to you social security number is handy. it doesn't need to be a secret, when you use it your id is verified by other means - just trusting a string of numbers that stays the SAME through your whole life and is given to countless officials staying secret is so fucking stupid to begin with that it's just a present for ID thieves.
and really, you don't even give it away that often(the ssn in nordic countries).