Why don't people identify the policemen and make their social life (outside of their police duty) a living hell. Bully their kids in school, boycott their spouses, refuse to do any kind of business with them (no groceries, no milk, etc.)

At some point people have to be held personally responsible for their wrong doings. They shouldn't be absolved of personal responsibility just because they're in the police force, which is being commanded by some nutcrack dictator.