Re: Intellectual property in general
I still think your movie-sneaking example isn't really an intellectual property issue, Spall. To me it's more of a trespass issue.
Ok, then change the situation to an outdoor drive-in movie theater. I own the property next door and I can watch drive in movies for free without paying the owners, and without exhausting any resources. Or, just take the issue of mp3 sharing over the Internet. Both of these involve non-exhaustibility and non-excludibility. In other words, both involve no harm other than possible lost opportunity costs.
And if your definition of immorality includes more than just imposing unwanted costs on others, what are these other immoral acts, and how can we justify them?