[sn_master]

It's about the potential for abuse. The police can use it as an excuse to charge or arrest you when they don't have anything else on you.

Most of the places with really bad traffic situation (e.g. India) already have cameras and infinite footage of violations, and they don't have any impact on law enforcement.

[strogonoff]

India aside, surely if you get arrested for actually breaking a law that’d be net good for society? Whether law enforcement wants you for an unrelated offence doesn’t matter; they won’t be able to charge you on that (if they had enough evidence, they’d have already done so).