From National Review:

There’s no historical evidence to suggest that the Second Amendment was “created to ensure Southern slaveowners the right to maintain & arm slave patrols to put down insurrections amongst the enslaved,” even if southerners subsequently used guns for their nefarious purposes. As Charles Cooke has noted, “That neo-Nazis are protected by the First Amendment does not indict the First Amendment, just as that criminals are protected by the Fifth does not call that bulwark into general question.”