There is a disturbing subtext to pro-piracy arguments.
While copyrighting general things like speech itself, or specific foods or whatnot is of course ridiculous. copyrighting specific individual executions of an idea is absolutely right and necessary. This is because everything that can be sold, including the physical, starts out as an abstract idea: an intellectual property.
The jaws of life stated out as an idea in someone's head, who then drew a rough schematic of it on paper, before it was mass produced into the physical life saving device it is today. No one can copyright the concept of pottery, but if a man creates a uniquely designed pot, with his own unique visual designs on it and sells it as his own unique creation, anyone making a pot exactly like his and calling it his own and trying to make a profit from it is obviously stealing his idea. No one can copyright paintings, but an actual physical painting that a man creates is his own unique execution of that idea. If you were to perfectly copy a William-Adolphe Bouguereau painting on a canvas, with the same tools he used (oil paint, mediums, etc.) and were to call it your own original creation, you would rightly be called a thief/plagiarizer of his unique execution of the painting concept. In the same way, while you can start your own hamburger chain, you can't make you logo a yellow set of arches over "Mcdonald's" text, and start selling burgers and fries with the exact same recipes and marketing strategies and say "this is my original intellectual property." Once again, you are stealing that specific execution of the idea.
Then we come to books, music, video games, and software in general. If a book is sold in the form of a collection of sheets of highly processed tree pulp, or if music, video games and software are sold on some unique physical proprietary physical form (such as vinyl records for music), pro-pirates will say that it is theft to take such things. However, as soon as these formats become digital or in compact digital disc form, in their eyes, it's no longer theft. What happened? What changed?
This is where the disturbing subtext of pro-piracy comes in. What do formats such as digital and digitally based discs have in common? Copying and distributing them requires a pathetically low level of effort. In other words, when a pro-pirate says "copying is not theft", what they're REALLY saying, sub-textually is this: "If it's EASY to copy, it's not theft."
Let's demonstrate this logic in action:
Sandy wrote a book. Getting your book published by a major publisher is very difficult, and the modern world, economically, is becoming more and more digitally based. So she decides to try her luck with selling/distributing her book digitally.
Pro-pirate copies her book and distributes it via torrent, etc.
Sandy: Stop doing that! I'm trying to make living off my work!
Pro-pirate: Your work is easy to copy and distribute, so it's not stealing.
Sandy: But I worked my butt of on it! It's my unique execution of the written word! If it were a physical book, you wouldn't be doing this!
Pro-pirate: So find a publisher who will make physical copies of your book.
Sandy: It's not that easy or simple!
Pro-pirate: Well, tough break toots. As long as your book is digital, it's easy to copy, and thus, not theft.