The thing people need to remember about south american countries is that if there is a war, it will most likely be with a neighbor. And that's why they want higher stopping power, since unlike the afghans and other impoverished nations the u.s constantly get's into wars with, south american's will face blood thirsty south americans in CQB combat almost instantly. They are very good fighters which is the main reason noone save other south american nations have been dumb enough to go to war with them. The Argentineans admittedly are the 'pansiest' south american country, (courtesy of their strong european heritage) but maybe being a failed state for ten years has toughened them up.
If you wound a south american they will become suicidal not suddenly retreat from combat. So you need to make sure you kill them outright. The stakes are higher in battle against equals.
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