Unbelievably stupid ending

Who would be so rash in just a matter of a few moments and what other three additional sane parties would cooperate? Especially after watching the movie I'd be like 'just hold on a moment. I've seen a movie like this and we end up alright'. But even without watching the movie I'd think about what would Turok the dinosaur hunter do, and wake my kid up and tell him 'son, it's time to man up or die, literally. You're about to be the first 7 y/o to become a man in a day. Ready?' Then I'd start banging my new hot wife to get us some new soldiers ASAP, offer the old couple a pair of bullets if they're not up for the challenge but urge them to help out anyway, not all quite in that order geez, to just take less than a minute to decide all of our fates like that after getting that far? Come on... Bh that time you'd've grown a whole other set of balls, might as well use em right?