US citizens aren't required to carry ID tho. If you don't drive a car or some other vehicle. If you don't fly or take the train chances are you don't have I.D. because you don't need it in your day to day lives. Or maybe you left it at home because again you aren't doing all those things etc.
Has it really come to the point where we are going to force people to carry I.D.'s just because? We are talking about someone going to the bathroom