Prosecute criminals, especially for petty crimes. Arrest jaywalkers and you're arresting violent offenders who skipped bail.
Don't release people on bail or otherwise if they don't show up for court. Hunt them down with bounty hunters and drag them to court and punish them severely.
Punish severe crimes severely. Murder = death. Rape = death.
Possibly bring back slavery as a form of punishment. If you steal, you become a slave until you have paid back what you stole. If you damage property, you become a slave until it is paid back.
People who self-identify as criminal get treated like a criminal.
Don't prosecute people who defend themselves and their neighbors from violent criminals. In fact, give them a reward.
Rioters get shot on sight. Looters get shot on sight.
Don't treat invaders and traitors as criminals. Shoot them on sight.
It can happen here in the US
It's really easy: