>> "... why do others not only feel no remorse about it, but actually seem to feel entitled to do [piracy]?"
Because in market societies, we have all been trained since birth to find the goods and services we want at the lowest possible price in the market. I feel entitled to buying Wrigley's Doublemint gum for 75 cents instead of 2 bucks, because it's readily available at that price. In this case the price of movies is zero, so people feel entitled to that price.
Anyway, another question for you: why don't you pirate?