Additional deterrent force is required, else people would always steal, and they'd be no worse off if they were caught than if they'd bought it in the first pla

Additional deterrent force is required, else people would always steal, and they'd be no worse off if they were caught than if they'd bought it in the first place. However, that retaliation is usually left to the courts in a society governed by laws. For example if someone steals from you, you can't just show up to their house and punch them.