You are discussing piracy in the context of media and copyright infringement, in which the owner of the pirated material is a corporation and the pirate is an actual person.

By comparing the act of pirating corporate owned digital material to a fictional scenario in which one person is copying another person's physical possessions very much implies that you see the corporate owners of digital material as people.

EDIT: I understand your point by the way. Is it ethical to pirate things? Maybe or maybe not, but I think the stance of most people here is that pirating stuff that is produced by giant, obscenely wealthy media conglomerates is generally okay.