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a million rounds (from 36 barrels) of lead a minute sounds just a weeeee bit extreme to me.
Actually, what such an impressive amount of firepower does, more than anything else, is create a deterrent effect. It's another thing to impress upon the world that the US is a military superpower, akin to the effect of the ludacris amount of nuclear weapons we have. Truthfully - can there be any purpose to having an arsenal large enough to kill the planet x3? Once is sufficient I'm sure. But the more weapons we have, and the stronger they appear, the more of a deterrent these weapons are. And deterrence is my favorite use for any weapon.