Justice Story had a better take with consideration of the historical roots of the recognition of the right:
The right of the citizens to keep and bear arms has justly been considered, as the palladium of the liberties of a republic; since it offers a strong moral check against the usurpation and arbitrary power of rulers; and will generally, even if these are successful in the first instance, enable the people to resist and triumph over them.
There's other types of emergencies that were very pressing at the time. Namely attacks from the Iroquois Confederacy and the Crown of England (once the War of 1812 broke), just to limit it to the early republic period.
This 1619 type revisionism not only portrays the period in an inaccurate shade but diminishes the accomplishments of men, like Peter Salem, and ignores facts agreed upon universally by academia like that at the time of founding miltias were composed of ordinary men.