I'm sorry, I should have been clearer. What I try to say is that you can't judge both piracy and slavery from your present point of view. I feel that because i

I'm sorry, I should have been clearer. What I try to say is that you can't judge both piracy and slavery from your present point of view. I feel that because in the past slavery was commonly accepted, that it was morally justified then. In the same way, given the huge proliferation of piracy, I feel that copyright infringement is somewhat morally justified now. This view might change and in the same way, the morality of piracy might change too. I would take the common views of society as the definition of what is morally justified and what isn't. It is possible you see this in another way and that is fine (and not absurd). Also, this change in zeitgeist is continuous, not as discrete as you overstate it is. We are perfectly justified to judge what has happened yesterday. Judging what happened during World War II is murkier and judging what happened when slavery was still extant is an almost meaningless activity.