But why does Holllywood feel it has to tell that side of the story every time?
Because film is a creative medium and it's a creative medium that makes money when it reaches audience expectations. Audiences today want nuance and subtlety (as far as those things can exist in any big Hollywood film), and the studios are going to produce less didactic films with fewer two-dimensional characters to accommodate those audiences and get more money.
If you simultaneously dislike the moral message of this media, and believe in a free market, you have to put all of the blame for it on consumers rather than on the producers of the film, videogames, music, etc. because the producers are only giving the customers what they want. A film maker in the US can either try to be an artist or try to make money. If you want to find moral lessons that please you, track down the artists at film festivals and art-house theaters and sort through them until you find a camp that is "black and white" enough. If you want to watch big productions, understand that the only responsibility of those filmmakers, moral or otherwise, is to make as much money as possible. The same is true for video games, music, and every other medium.
If you want to change that fact, you should address the consumers of media rather than the producers. In this ccase, supply will follow demand and not vice-versa.
I heard an interesting report on the radio a few months back about how the lyrical content and the sad or happy (usually major or minor) key of chart-topping pop songs have become increasingly at odds with one another over the last 50 years. Listeners now prefer the nuance that comes with happy lyrics over a melancholy melodies, while, in the '60s, they preferred songs that were unambiguously happy or sad.