you do not have to show any ID to receive medical treatment in america.
nice try though.
How about the argument that photo ID is required to board a plane and for many other routine actions, so what’s the harm in requiring it for voting? Posner points out that the requirement of photo ID for flying is “a common misconception.” Nor is it true, as the three-judge appeals panel had it, that photo ID is required to pick up a prescription (not so in Wisconsin and 34 other states, Posner observes); open a bank account (not true anywhere in the country) or buy a gun (not true under federal law at gun shows, flea markets, or online).