The point isn't whether music sharing is legal or not (or whether most people know it is legal or not). The point is that most people feel that sharing music is moral. If it's illegal, then the law does not fit with their morals.
I don't think you can equate music files with personal data or business secrets. Music is much different. It's broadcast to the public over radio, in stores, on TV, etc. It's meant to be heard by as many people as possible.
The point isn't whether music sharing is legal or not (or whether most people know it is legal or not). The point is that most people feel that sharing music is moral. If it's illegal, then the law does not fit with their morals. I don't think you can equate music files with personal data or business secrets. Music is much different. It's broadcast to the public over radio, in stores, on TV, etc. It's meant to be heard by as many people as possible.