I don't know if "shown to allow" is quite the right way of looking at things. That's how we, as a nation, choose to read a sentence that could be read at least a couple of ways. 2A is remarkably short:
A well regulated militia being necessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed.
There's a few different things going on there. Security of the state is given as the rationale, not tyranny-fighting with Patrick Swayze in Red Dawn. "Well regulated" is emphasized, which would seem to imply some sort of hierarchy and organization, things that 2A activists generally ignore. Also note that the right is given to "the people," not to individuals as such. You can choose to read "the people" as each and every individual on their own merits, but that's a deliberate choice, and not the only reading.
Anyway. For the last eighty years or so we've chosen to read "shall not be infringed" as the crucial sentence clause, and that's just how we roll, yo. But that's a function of politics, courts, case law, and so forth. It's not the inevitable or only reading of 2A.
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