To start off... The ending is the ONLY reason I gave this a 3. May not be the most entertaining, but not all masterpieces have to be entertaining.
We have to change the mindset we've been forced into by luxury.
This movie explains that all can come to an end at any point, and that it can happen so simply with the right complex mindset, strategy, and preparation.
I've always said that it's been hundreds of years since America was a battlefield. It's only counting down until that day comes again.
Only this time, it may not come in the way that we imagine. With an open mind, you can actually see this possibility, and know that the "crazy" people witll be the only 1s to survive suvh events.