In case of this movie, unbeknownst to him, Ender was unwillingly playing 'god' and ultimately brought about the extinction of a race of aliens he'd been taught to hate, but had never encountered himself before. The end result of being forced to kill off an entire race that was only fighting for survival had a very big impact on Ender, and made him question himself as a human being and the decisions he'd made in the past. Likewise, because he'd been receiving messages from his enemies throughout the whole movie, Ender had learned to accept, tolerate and even love his enemy after he'd destroyed their planet. Why? Because as a human being, he felt he had no right in playing 'god' and deciding the fate of a species humans in general barely understood.
That was what I picked up from the movie. I'm not sure if that was the intended message, but I picked it up and it helped to open my mind to an entirely different realm of character development for story ideas. Not only that, but it helped to present new ideas to me in terms of stories. I'm not saying I intend to write another Ender's Game, but I am saying that it has given me thoughts on how I can take what I got from the overall message of the movies story, and adapt it into new and original ideas of for my own stories.
The scene before the final fight that ended in the extinction of the Formic aliens.
