I'm a copyright holder, but I've also been an infringer.
To give a concrete example, a few months ago I took my mother to see Avatar in 3D. Within ten minutes she had a headache and we left the cinema. She was upset at missing the film so I downloaded a copy and she watched it in 2D at home. On the basis that we'd already paid to see it (and hadn't) I think that act of piracy was morally justifiable.