None of what Bigelow said in that quote was reflected in the movie. Plus, she herself stated in many interviews that she wanted the movie to not take any political stance, but focus on what the soldier's job is all about. The movie in no way tried to say whether or not the efforts of those soldiers are in the end worth it, or if they're just risking their lives for nothing.
I also don't think that anyone who is a soldier should complain about how hard they have it. After all no one forced them to join the army (I believe that there is no mandatory military draft in the US) and a lot of them joined especially to fight in Iraq and Afghanistan.
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