Second, ID cards.
I have a Driving Licence that I carry in my purse all the time. I had to pass a test to drive, I have to be traceable because I want to drive and there are certain obligations on me because of that. The objection to ID cards isn’t about having a card with your photo on it. It’s about having to have one just to go about your daily business, when nobody, nobody at all, has the right to ask you why you are here and what you are doing.
As for the suggestion that I might just not be used to it; I lived in France and carried my Carte de Sejour like a good girl, because they are the rules in that country. I lived in Australia and was once breathalysed just as part of a surveillance of everybody driving on a particular road at a particular time. We’re not in France, and we’re not in Australia; Policing and government in this country is by consent, they work for us, not vice versa.
It’s got nothing to do with whether proof of identity is related to ethnicity or colour. The fact that any officer of the law can ask you what you are doing walking along the street in your own country is not acceptable, not because we’ve got anything to hide, but because its none of their business.