I think its about consideration for others. There's plenty of research on 2nd-hand smoke, and extra info on a menu or at the grocery store doesn't sound bad to me (we don't have that where I live). But I'm not not going to sidetrack this thread any further.That mentality - "X is a public issue!" - is precisely what I'm talking about.
Anything can be made a "public issue". That's how Prohibition came into being. Now every restaurant has a calorie count next to every item they serve, because that's a "public health issue". Kids have to eat federally-regulated lunches in schools because that's a "public health issue".
There are many reasons music is dying. I would say the death of individualism can certainly be considered one of them.
As for the "you have a right to do X as long as it doesn't affect anyone" - that's simply untrue. You have the right to X unless there is a law against it, full stop. If what I do affects you, tough. Leave. I have just as much right to do legal things in public as you do not to.