In my opinion ideas were expressed very clear in the film. Ender was special because behind his power to resist there was also talent to organize and overcome ego. His rivals like his destructive brother and "bad" guys in the program didn't see beyond their egoistic motives. So the film examines psychology of leadership. It is the first layer.
The first layer deals how to organize the will of numerous egos into one cooperative unity. Then their is the second layer which perspective is even more complex and bigger in scale. It examines the survival and strategy of organized units ( struggle of different civilizations). Military department of every government in our world is aimed to destroy the enemy. Ideological machine makes its citizens to believe that foreign civilization is there to destroy them. If on individual level we have made progress and came to understanding that we can coexist but on the level of big units or species ( countries or civilizations) there is still severe struggle for survival ( it's either you or another will survive, no alternatives). And the film deals with the complex problem: as individuals we believe in coexistence but on the scale of species we are ready to destroy each other and can't do anything about that. We can overcome ego in individual ( making huge efforts) but we didn't learn and don't know how to overcome ego of large groups.
I can closely relate to these two layers of the film. I can relate to the first layer as a guy who has served in the Army ( though for short period of time) with "dog eats dog" order. "Ender's Game' book should be given in our military forces as a must read to restore order and civilized relationship among soldiers. I know that in the USA this book is a part of marines training helping to understand leadership skills.
I can relate to the second layer as a guy who was brought up in a country which was confrontational to the world. I'm not living in Russia but I see that Putin is returning the country on confrontational path and is restoring Soviet order with extremely hostile attitude toward the West.
Ender's Game is hands down the most compelling and thought provoking sci-fi movie of last year. In comparison very popular movie Hunger Games is completely fake and artificial.
I enjoyed reading your analysis, but I disagree that these issues were presented in any sort of meaningful, organized, or intelligent manner in the film. I have no doubt the book delves into all of this, but if I'm just taking the movie at face value I don't really see any of that explored beyond a very superficial level, if at all. Harrison Ford's unwavering belief that Ender represents the one unique leader he believes will lead Earth to victory against their enemy was completely unfounded in terms of what the film presented. And to take a risk of such magnitude at the end of his training? The extreme cavalier nature of that decision completely goes against and invalidates the idea that the very people they are trying to protect and defend have any value at all. To me, it came off a a commentary on their expendability.