Because if I'm getting threatening messages telling me not steal at the start of a movie that I have paid for I am going to be pissed off, and I will react by n

Because if I'm getting threatening messages telling me not steal at the start of a movie that I have paid for I am going to be pissed off, and I will react by not paying media in the future. Especially since experience has told me that there's zero repercussions for pirating, and it's usually far easier to pirate than to pay. Note that, rationally, I should take note of the distribution company and react by not paying for their media in the future. But I don't have time for that, so I'm more likely to react by not paying for any media of a similar type (movies and TV) in the future.