Piracy is not theft: it's... piracy. Theft implies denying the legitimate owner possession, and piracy is simply making a(n unauthorised) copy. If I steal your bike, you'd be stranded; if I were to make a copy of your bike, you'd still be cycling, and not inconvenienced.
I'm not justifying piracy, I'm merely clarifying that it is not the same as theft, no matter how frequently people claim it is.