Just one specific point of contention. A physical object is very different from an object that can infinitely and effortlessly be copied with 0 degradation of that thing.
I think you are making a good argument and but maybe not the best example.
I think there is significance in the difference that needs to be accounted for in any discussion of piracy as theft.
It is currently, and has been for a long time, legal to copy music from the radio or movies and tv shows from a broadcast(but not pay per view, or copys for distrubution) or go to a library and borrow whatever interesting (to you) media they have.