That’s an interesting perspective actually, since it gets into all sorts of weirdness and trickiness of the intellectual property concept. Perhaps because of two factors: (i) we treat digital data as fundamentally different from physical objects, and (ii) theft intuitively implies that the original object is no longer with the owner, but with piracy, you’re simply making a copy-and-paste, rather than a cut-and-paste.
In the end it’s all just a linguistics game though - you’re profiting off the work somebody did, without paying the rate they charge for it.
But that’s exactly the kind of answer you’ll get in a community focused on piracy. Most people wouldn’t be here if they hadn’t already justified piracy.