There's always a theme I'm drawn to, that we humans are not good or bad. We're all a mixture of both. We can have great compassion or commit great violence.
Most big popcorn movies are 'bad guy does something to good guy, good guy gets revenge on bad guy, sets the world right, and moves on.' And 'Ender's Game' is just not that simple, so it's an exciting challenge. It's a little terrifying, and let's see how audiences respond.