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.
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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.