That's the problem. We hold video games to a much stricter standard than movies. A double standard.
We celebrate extremely violent movies and vilify extremely violent games. We praise movies for having abrasive political scenes, but when games do the same thing, they're dismissed as meritless entertainment.
I agree that there is some double standard, but I don't think it's so black and white as you've made it seem. Violent movies often run into the same criticism that violent video games do. And I know I've seen video games praised for their content. I think that the double standard that exists is because video games are a much newer medium than movies are. I'd be willing to bet that movies ran into the same level of criticism when they first emerged.