I would be stealing if I were charging for allowing others to copy my music. That's not happening.
Folks are just giving it away.
That being said, I understand why RIAA is upset - they think they're making fewer profits because fewer people will buy music if they can get it for free. Duh.
The answer, IMO, is not to make laws that distort the market. The answer is to adapt to technology to conform to the market.
I think I should be able to let others listen to my music, ride my bike, borrow a shirt, etc. If I'm not charging for any of these things, what's the violation?
No you would be profiting from your theft if you were charging. You're stealing without profit. It's still stealing.
No the RIAA is upset because people who do not own the copyright are copying things illegally. Whether or not the people illegally taking those illegitimate copies would ever pay is immaterial. What's material is that copyright law is being violated in massive quantities and that the criminals shrug their shoulders.
How could they conform to the market? There's no way to "compete" with people illegally distributing your copyrighted material for free.
The violation is that copyrighted materials cannot be copied without the permission of the copyright holder. None of this is new, they aren't making new laws, the concept of copyright is in the Constitution.
You're free to let others listen to YOUR music, a copyrighted CD you bought in the stores isn't YOUR music, it's someone else's, they also are free to let others listen but on THEIR terms not yours.