I like how my social security card explicitly says not to be for identification and tax purposes only. But I need for absolutely fucking everything and to identify I'm a citizen. Can hardly sign up for a new email without a SSN. (Exaggerating of course about the email)
It's kinda worse than that --- it's used to authenticate yourself as a citizen.
My SSN should at most be an ID, no different from a name. I can identify myself as Darth Vader or 4200-69-1337, but that shouldn't matter, because I should never be able to authenticate myself as either of those.