I think you misunderstand. It's not that they took a picture. It's that they used some vague algorithm to determine if they have permission to rifle through your private life. Or arrest you even if you haven't committed a crime.
The best outcome here is for cops to get bored, ask the city to offer a tax incentive to businesses to scan for known criminal faces & report 10 seconds CCTV before + after a hit is found, and now the police have a statistic they can use for policing. The big scandal is when "known criminal faces" start to contain "just alleged that X did Y", at which point it's merely political. If you are X, wait for the arrest and sue the city when you're proven innocent.