Which assumes that people wont try to trick the system, which is a different kind of beast in public transport.
Also: in nations that had communist regimes in them, public cameras with facial recognition (biometric tracking of humans through their habitat) are for some reason not nearly as popular as in the parts of the west. A west that is still naive enough to believe they will have democracy indefinitly without ever doing anything for it, while providing all the perfect technology for any next extremist takeover including racial genocide.
We like to think our institutions will save us and they can’t be broken in a changing technological landscape, but like with denying climate change these are the arguments of an optimistic gambler, and not of somebody who thought about the risk and decided it is not big.