Unfortunately almost anything these days seems to get labeled an infringement of human rights or civil liberties. If having proof of identity or being asked a question by a police person is the worst infringement you have to put up with then I would say you're very lucky.
We have ID cards in France and they are very useful and no one seems to be suffering too badly from having their rights violated and trampled all over. People in the streets don't get all upset when a Gendarme talks to them.
The only people that should get upset about ID cards are the people that don't have them... ...for whatever reason.