All countries exist as distinct entities because they can maintain what Max Weber called the
monopoly on violence within their geographic bounds.
https://en.wikipedia.org/wiki/Monopoly_on_violence
https://en.wikipedia.org/wiki/Use_of_force_continuum
In countries where we don't have trigger-happy cops, the story continues this way:
* The person commits a crime or tort. Your courts fine the person.
* The person doesn't pay the fine. You extract the fine forcibly from their bank account (or force their employer to dock their wages, or forcibly obtain and auction their assets; let's go with the bank example)
* Why does the bank comply? Because you can revoke the bank's right to trade.
* Why doesn't the bank just trade anyway? Because if they do that, you can enter their buildings and take their equipment, arrest their employees, etc.
* What if the bank tries to stop you doing that? Then you send in armed police.
* What if the bank shoots back? Then you send in the army, and at worst case encircle the bank and lay siege to it.
* What if the bank has their own army which they use to break your siege? Send in your bigger army. Also have laws against private armies, and spend your time detecting private armies and breaking them up before they get bigger than the state's army.
Most people comply with the state at the earlier steps in this chain, and the state runs all the smoother for it. But you can see in failed states, one of the main reasons for the failure is some group (or groups) inside the state have managed to develop a bigger army than the state itself, or parts of the official army break away from the current government or attempt a coup. At that point, it's not the current government's country any more, it's up for grabs. The government (and the entire system of law it represents) has lost the monopoly on violence.
The point of the GP's post is that all laws are ultimately backed by violence. Most rational actors don't let law enforcement reach the explicitly violent part, but it's still there.
To bring it on topic, what this highlights is it is much better to fight against bad laws while they are just proposals, it is much harder to fight against bad laws once enacted.