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There are some debates, however, that the first clause of the second amendment actually is meaningful and not just meaningless flavor text.Nobody says it's meaningless, it just doesn't mean what gun control proponents want it to mean, due to (a) a purpose, even a stated one, not being a limit on Constitutional rights; and (b) what the word "militia" means in the text.
(a) "The prefatory clause does not suggest that preserving the militia was the only reason Americans valued the ancient right; most undoubtedly thought it even more important for self-defense and hunting." District of Columbia v. Heller. There are numerous rights in the Constitution that are not limited solely to their original or documented purpose. The equal protection clause protects against gender, sex, and sexuality discrimination just as much as it protects against discrimination based on race or condition of former servitude. The First Amendment protects artistic expression and personal speech just as much as it protects political speech. A documented purpose does not limit the applicability of a Constitutional right.
(b) It is nearly a century-old precedent that the militia refers to every able-bodied man, not just those in, e.g., the National Guard. United States v. Miller, 307 U. S. 174, 179 (1939). That is why "the militia is assumed by Article I already to be in existence," District of Columbia v. Heller, rather than being created by Congress or a state.