Ironically, many card subjects come to interpret this state of affairs in a contra view (the card helps streamline my dealings with authority, rather than the card is my license to deal with authorities). The Australia Card campaign referred to the card as a license to live.
The above is from the ID Cards FAQ by Privacy International. Highly recommended reading, for the sake of us all.
A more fundamental question:
Why doesn't the UK dump IWF and censorship?
Why should we hope to have 'appropriate' censorship, or hope that censor 'mistakes' can be 'corrected'? When we accept censorship as a tool 'for the common good', and get caught in Byzantine discussions about which speech/'content' is more or less 'harmful' and should be less or more free (instead of adopting a simpler view like the one in the US First Amendment), we are already sliding down a very steep, very slippery slope.
An authority is a person who can tell you more about something than you really care to know.