alt Hacker NewsIt might not be theft but it's not nothing either. Manslaughter isn't murder but someone still died. Copying might not be theft but you're still taking something you didn't pay for.
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It is an infringement on one's right to control the reproduction and distribution of their intellectual property.
This right is enforced by the authority that grants it. Viewing, listening, or otherwise 'consuming' this IP is not and cannot be an infringement on these rights. Those who provide are responsible.
If a country does not grant or enforce this right (or on behalf of others) then there is no infringment possible in that jurisdiction. cf. China or Russia.
Moral arguments beyond that are your own and should be clearly segregated from the law. Murder is, almost universally, both criminal and wrong. "Piracy" requires more attention to detail in order to have productive conversations.
Then use an accurate legal term for it, "copyright infringement", or a pejorative that both supporters and detractors agree on, e.g. "piracy"