Do you really think it can be dismissed out of hand that easily?
The RIAA (and the MPAA)'s practice has been to reserve itself the right to prosecute as many people as possible. It doesn't matter that they don't always do it; they simply want the power to do so, so that they can charge as much money as possible. It's business. In fact, I thought that one of the key points of the DMCA was that this sort of thing was illegal.
Doesn't matter whether it's right or wrong or appropriate or not, the RIAA will put up a fight for it because it could potentially double their market. It's good business practice, why should you expect anything else from them? Pleasing the customer is no big deal for them thanks to the wide distribution of their products and the level of establishment of big companies. You can find music distributed by the RIAA on the radio, in bookstores, in video stores, in drug stores, practically anywhere that sells CDs, but you really have to work to find independent music.