Copyright and theft occupy different legal, historical, and philosophical spheres. Therefore arguing against copyright infringement because it is a kind of theft is fallacious.
Copyright was created because the old system of guild-based monopolies collapsed and authors demanded that the Parliament deal with the influx of cheaply copied books devaluing their works.
That is, the basis for copyright law is in economics and politics, not morality. Passing off copyright as theft creates an emotionally charged environment where rational discussion is difficult.
I intentionally avoided the larger argument because it's about copyright-as-such and how it applies in the digital age. There are people talking about it who are far smarter than I am.
I'm also intentionally not discussing my opinions about the status quo.
My point was intentionally narrow and I don't really think it's necessary for me to repeat it.
Whether copyright infringement is "free riding" and whether or not "free riding" is immoral will have to wait for another day.
Cheers, Jesse
The idea of copyright extends beyond money. By being able to freely copy an artist's work the artist loses control of his creation. Bill Watterson, the creator of Calvin and Hobbes, did not license out his characters for lunchboxes or plush toys because he felt it would hurt the artistic value of the comic, even though he could have made much more money licensing it. He was able to prevent licensing because he owned the right to copy his creations.