re: What does the phrase “aim small, miss small” mean?

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Not sure how that makes it not-dumb. Within the context of the movie, the boys are good, practiced shots. I don't think that mantra makes a lot of sense to them at that point.

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They're good practiced shots shooting at targets and game. Shooting men who shoot back is much more stressful and dangerous. Their Dad was steadying them for the chaos and killing to come by reminding them of what's the simple first principle of aiming, what's true, and what's familiar.