We have laws, those laws are enforced very well. For the most part. (The vast majority of police officers are well trained and dedicated to their profession.)
The police bring the alleged perpetrators in for prosecution.
Because the legal system is so expensive, deals are made, winks and nods all 'round...
Then the courts let the lawbreakers back onto the streets. Sometimes immediately, sometimes after the perp has done "time served."
The politicians (at all levels) will then, rather than provide more money to law enforcement and more oversight to corrupt courts, pass new laws to "ensure" that the old laws are enforced.
"But, but, guns are illegal in this jurisdiction, how could that three time convicted (three times released) felon manage to get a gun?"
"How did that drunk driver manage to get behind the wheel of a car and drive drunk again? We took his license away!"
And so the story goes...