One could easily argue the F/A is unnecessary in any typical civilian self defense situation, but the argument falls apart if extended to the purposes of repelling a foreign invader, or other scenarios pertaining to the security if the (free) state.
Foreign invaders would almost certainly not concern themselves with an F/A ban, putting the citizenry at a disadvantage. The purpose and effectieness of 2A, in that scenario, would have been undermined by an outright F/A ban.
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