I'm yet to be convinced that the removal of privacy has any effect on the level of crime, nor do I believe that to be the primary motivation for it
My thoughts on that are probably not very popular on here and those are to just build larger jails and equip those with drug rehabilitation options. The larger jails allow us to not just kick the people back on the streets immediately but compel steps that help eliminate recidivism. Another source of criminal behavior is mental illness. I have no clues on how to fix that except perhaps concentrate on the causes.
All these cameras and recording devices exist for that same reason Advil exists in that it helps a toothache. Doesn’t really solve the problem but fights the symptoms.