Actually it is. Only the state has the right to imprision and prosecute anyone, and the police force has the right to impose public order by force if necessary,

Actually it is. Only the state has the right to imprision and prosecute anyone, and the police force has the right to impose public order by force if necessary, and the military has the right to hold weapons and defend the nation's borders. Those are all things the state has the sole right to do, and not a random citizen who just felt like it.