Disclaimer: Read all statements about morality and ethics with an implied "in my view/opinion" attached. Also, this is all ethical/moral theory of piracy, any application to real-world events would need to be decided on a case-by-case basis.
TN, the reason you and I will never agree is because I don't believe a creator has an *absolute* right to control their creation, though they do have a fairly strong right. However, I think piracy-to-demo (not piracy-to-own) falls into the category of fair use (ethically/morally, not legally). I believe people only have a right to stop other people from doing something if doing it hurts someone in some tangible way. The metaphysical injury of "they're using my creation in a way I don't want them to" isn't alone sufficient to create a moral right to stop them from using it in that way. Unless and until the creator suffers some tangible harm from the use they have no right to stop it.
I do believe creators of intellectual property own their creation, however I believe its nature as intangible and effectively reproducible at 0 cost limits some of the ownership rights we generally associate with physical objects. I have the right to say "no you can't try out my laptop" because by its very nature if you're trying it I'm being deprived of it and thus suffering harm. But with infinitely reproducible property the person wanting to try it merely makes a copy to try, and the owner is deprived of nothing to which they have a right.
IP owners though do have a right to profit from their creation, control the means of commercial distribution, etc. Trying out the creation is fair use, but simply taking it without compensating the creator is not. Obviously, however, there's no easy, cut-and-dried way to determine at what point the use stops being merely a "trial" and the user assumes the moral duty to either purchase the product or stop using it. There would be some clear cases, such as the person who pirates Civ V and plays it for 500 hours; obviously that is more than a mere trial, and that person has wronged the content owner. From a theoretical perspective would be whether the user was actually and in good faith sampling the product, or whether they wanted to have it as owner, but as has been well established in the real world there's no way to know that.
I would simply say that while piracy maybe shouldn't be legal, as simply making it blanket illegal is the most easily applied in a real world in which we can't know the thoughts and intents and others, perhaps people shouldn't be so quick to condemn every single act of piracy as a moral wrong against the content owner, or say that piracy is always wrong in all circumstances. Maybe most acts of piracy would be wrong under my framework, or maybe not, none of us can know that.