I loved the movie, and I can forgive them pretty much anything they did.
DWARF said:
..., is it just me and my friends that entertain a fairly Nietzschean/Darwinian mindset at times? I mean, we constantly go over best plans in given situations, go over tactics and choices given many apocalyptic situations.
Yeah, it is just you.

Or, well, some of us. Gamers, that is! Most people never even conceive such things can happen to them, and won't live through it except by luck. And thinking/planning for such a thing is far different from training for it, which is far different from it actually living through it. In such situations, even people who prepare for such things more often than not find themselves just as overwhelmed as those who sat around and watched Eastenders.
In other words, no, it's not lazy writing or 'stupidity' you see in a lot (but not all; some ARE stupidly written) of these films (save in those where it's an ironic point): it's the fact that the brain doesn't deal well with having the mat jerked out from under it.
A good illustration: Jason X; the girl at the shuttle controls. All she has to do is wait for five minutes and everything would be perfectly fine. However, she's terrified. All she wants to do is Get Away and Live.
1. People do not behave well, or rationally, under stress. Having your entire world torn out from under you in less than a month counts as stress.
2. I think we can agree that the military commander was a freaking looney toon and most of his men were just as crazy as he was.
Just because they have slightly more weapons and have had (maybe, depending on their specialty) a couple weeks training in dealing with tactical situations doesn't mean they're any more effective at dealing with the situation they've found themselves in.
They haven't trained for the situation, are cut off from their chain of command and support structure, don't have the massive infrastructure below them they're used to... they can't even cook for themselves. They're just waiting for things to end.