I'm normally the last person to fall back to the terrorisim issue in these sorts of arguments, but I personally don't want any random person to be able to travel absolutely anonymously for any number of reasons. I gladly give up a little of my anonymity through vehicle registration and licensing because I know that the drunken asshole in the next lane headed to his ex-girlfriend's house (who has a restraining order against him, BTW. Oh, and he's a pedophile too.) has to give up exactly the same amount of his anonymity too.
I'm normally the last person to fall back to the terrorisim issue in these sorts of arguments, but I personally don't want any random person to be able to travel absolutely anonymously for any number of reasons. I gladly give up a little of my anonymity through vehicle registration and licensing because I know that the drunken asshole in the next lane headed to his ex-girlfriend's house (who has a restraining order against him, BTW. Oh, and he's a pedophile too.) has to give up exactly the same amount of his anonymity too.