Identity Cards Bill

I am deeply grateful to the right hon. Gentleman. He said earlier that he thought it was a gross infringement on the ancient liberties of the British people for the state to insist on somebody carrying an ID card. But, as I understand it, he believes that it is entirely appropriate for the state to insist that people should carry a passport when they fly into or out of the country. Why does he not see that there is a paradox there?