Imagine there is a technology that could copy tangible goods such as cars. Now somebody makes a copy of your car. Your car was not stolen but you may not be happy with the fact that somebody now also has a copy of your personal belongings like a smartphone that was inside the car.

This is where copyright law comes into play which only allows copying the car only under your rules. If somebody doesn't follow the rules that doesn't mean they stole your car but it still means they should receive some form of punishment to prevent future copyright infringement.