I think I come down somewhere in the middle here. I don't think it's particularly harmful for me to copy something for personal use without trying to pass it off as my own if I wouldn't otherwise be inclined to pay for it, but I do think there would be value in society having a way to let people retain the benefits of things they created for a reasonable duration. I don't think that US IP law does a good job of this though because in practice it seems to be wielded in pretty much the opposite way that I think would make sense, with more frequent and larger punishments seeming to be inversely proportionate to the benefit that the one doing the copying gets and the harm inflicted to the original creator.