Because you go into a store and take something that store on longer has against its will. Copyright infringement is just someone else willingly duplicating data that you want, while the entity that holds a state granted monopoly to duplication (not necessarily creator) has not authorized the transfer.
One is robbery of scarce resources, one is a legal framework around imposing scarcity on something that is not naturally scarce.
You can steal a movie - in the traditional sense of the word - by breaking into MGM / Disney / Universal's internal network and copying the movie out from their own internal servers. This does happen, where scene releases of unreleased movies happen, often done by employees with access to get access to these films prematurely. That is the only situation remotely comparable to the shoplifting scenario, because in the normal piracy scenario nobody is not voluntarily participating (the original buyer of the movie who then shared it did a voluntary transaction, then violated the distribution terms given them when distributing it to others voluntarily).
Violating a contract and violence are on entirely different planes of ethics.
One is robbery of scarce resources, one is a legal framework around imposing scarcity on something that is not naturally scarce.
You can steal a movie - in the traditional sense of the word - by breaking into MGM / Disney / Universal's internal network and copying the movie out from their own internal servers. This does happen, where scene releases of unreleased movies happen, often done by employees with access to get access to these films prematurely. That is the only situation remotely comparable to the shoplifting scenario, because in the normal piracy scenario nobody is not voluntarily participating (the original buyer of the movie who then shared it did a voluntary transaction, then violated the distribution terms given them when distributing it to others voluntarily).
Violating a contract and violence are on entirely different planes of ethics.