>>jandre+KU
The thing I don't get about the non-religious arguments is that we already have a national ID, it's just a patchwork system of unreliable, not-particularly-secure forms of identification that are a pain in the ass for a regular citizen to have to deal with. And the REAL ID stuff essentially makes state IDs conform to a national ID specification anyway.
And regardless, if you do want a national US ID, you just get a passport, and it'll be accepted as a form of ID everywhere a state-issued driver's license or state ID is accepted. Of course, in this case it's technically voluntary, and many Americans don't travel internationally and don't bother to get a passport.