Sure, but taking this to its logical extreme, it seems like I could justify any act as long as it’s also legal.

While I totally agree with the advice of “it’s illegal so you probably shouldn’t do it”, I don’t think it’s a terribly interesting conversation philosophically. Deferring to human law in these discussions feels like an existential cop-out.

I think the question is substantially more interesting if you pretend that you have a magic wand to make the laws whatever you want, and then ask “why would it be wrong for me to torrent a game that I have purchased a legal copy of?”