Rant Warning: "Piracy isn't stealing." Um... what?

So, twice now I've heard someone use the argument that "piracy isn't stealing." All I have to say is WHAT THE HELL ARE YOU SMOKING????? By definition, piracy is stealing. It absolutely, completely, and totally makes me frustrated beyond belief that people are even trying to claim it's not. Arguing against DRM is one thing. But saying that if someone steals someone else's work, it's not theft? That's just not even logical!

Piracy: a : the unauthorized use of another's production, invention...