"Crime" is a very loose term. Things like robbery and assault are obvious but there are a lot of laws out there that have no real "victim", or are enforced only when the powers that be have an inclination to.
They're okay with the surveillance if it's going to prevent terrorist attacks or even more localised crime.
And most of the citizens couldn't even be bothered about losing access to non-Chinese Internet websites. The Chinese ones are good enough or sometimes even better, tailored to their tastes.
It does cost vast amounts of money though. China spends more on surveillance and the police than the entire military budget.
But would they prefer even more to have a choice in the matter?
Hi, I'm autistic and I'd appreciate it if you didn't use me as a synonym for "stupid," thanks.