It's really simple, I ask myself, "Am I hurting anyone?" If buy a DVD, watch it and give or trade it away, I haven't hurt anyone because only one person can watch it at time and there is nothing wrong with that. You publish a book and maybe 100 people read it in its life, but only one at a time. In fact I've done them good because they got the money they earned for their work.
If i download a movie from the net without paying for it, then hand it out to everybody who wants it, and they hand it around to everybody who wants it, and they hand it around to everybody who wants it, thousands of people can watch it and the creator never gets a penny. Multiply that by everybody who steals it. You're talking about millions of views and dollars.
They risked and invested 100 million dollars to make a movie and spent years and countless hours on it and now millions of people are watching it without paying.
Do no harm.
Bob