Alan Johnson blathers on about how voluntary ID cards will be wonderful at protecting our identity.Of course, creating one single card, easily forged, that proves identity will simply make theft of identity easier.But, here’s the kicker:Our identity, the information that makes us unique, is something that we get called upon to prove each day, when we are opening a bank account, renting a flat, proving our right to work.Those aren’t, of course, things that we do every day. Any one individual migh