Under the traditional American definitions (somewhat modified from the British), the “militia” consists of all free persons. In 1789, that excluded women and slaves. In 1775, in England, it additionally excluded members of religious and political minorities, including Jews (though in the American colonies, most of which were populated by dissidents and undesirables from Britain, they were less fussy).
If you believe the government is inherently benign and that we can always trust our security to state, there is no logical arguement to support private ownership of weapons. American Blacks certainly don’t trust the government, and while the current government under Donald Trump is one we can certainly trust, there is no guarantee what the future holds. We should remember that it took only a generation for German Jews to go to highly assimilated, well respected citizens of the Second Reich, to pariahs and outcasts under the Third Reich – and disarming Jews was among Hitler’s first anti-Semitic laws.