Our Constitution did not arise out of nothing. The 2nd Amendment has quite obvious precedent in the English Bill of Rights that was a result of the Glorious Revolution of 1689.
“That the subjects which are Protestants may have arms for their defence suitable to their conditions and as allowed by law”
This idea was carried over into the 2nd, with of course the religious and class aspects removed, as these were not relevant in America.
IOW, the 2nd was expanding a previously recognized right of Englishmen from upper-class Protestants to the entire People.
I understand and accept your observations as completely valid. Unfortunately, the left views such historical precedents as completely extraneous and irrelevant to their agenda.