Amazing Grace and Chuck (1987)

Average American boy Chuck Murdock goes on a school outing to a nuclear weapons facility, where he learns about the destructive power that sits at the fingertips of the military. Knowing that the world could end with the push of a button, he protests against nuclear war by walking out on his Little League team during a game. Chuck's stunt ends up in the local paper, and as the story snowballs, basketball star "Amazing Grace" Smith decides to boycott sports, too.

Unfortunately the movie Amazing Grace and Chuck is not yet available on HBO Max.