There's a big difference between downloading of music and a red light for taking video. In fact one might be able to apply the categorical imperative and see that most people would want the red light viewable by others, but there is no similar desire when it comes to not downloading music.
That is, this is about creating a desired societal norm. You're right, there are people that will violate this regardless. There's always someone who will hide a camera in the girls bathroom, and there's little you can do to stop it, but yet we've been able to get to reasonable place in society that we still assume there aren't hidden cameras in "private" places.
That is, this is about creating a desired societal norm. You're right, there are people that will violate this regardless. There's always someone who will hide a camera in the girls bathroom, and there's little you can do to stop it, but yet we've been able to get to reasonable place in society that we still assume there aren't hidden cameras in "private" places.