> There seems to be a subset of law enforcement officers who fundamentally don't understand privacy, checks and balances, and responsibility.

This is why two things should be mandatory for new officers: psychological examination and a mandatory law degree from a qualified institution. If you're enforcing the law, you need to actually know its contents and how it works. That would naturally limit the numbers and discourage people who haven't gotten over high school from using their job as a torment nexus.