>like we have to do with every other product?

That's not a very progressive spirit. It might seem unfair, but technology has changed the rules of the game. The consumption of many goods has become non-rivalrous.

Whereas taking goods off shelves without paying is covered by other laws, copyright is about forbidding you from sharing what you bought with others who didn't buy it. That's much more debatable.

Reducing this issue to "let's do what we do with every other product" would undo some of the achievements of the technology and hold us back. Copyright has to stand on its own, it can't be justified by analogy to rivalrous goods.