Legalities aside, generations of Americans have been brought up on the merits and power of individual rights and freedoms. One of these is the ability to not depend on government or any other aspect of US society to "defend themselves" You know, upright, (men) standing tall and unafraid, with steely eyes, wrapped in the flag. (NRA have piggybacked on this myth, brilliantly)
Now of course, the Constitution's 2nd amendment was ratified in 1791 - when "bearing arms" was a different concept entirely:
"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 are enough folks on the alt right, who haven't moved an inch intellectually, since them.....and still fantasize about forming militias to "deal with" immigrants, "big government", Jews and certain other religious groups, and various folks of race and colour.
I have had opportunity to discourse with some of these people - both on-line, and from my days as a Civil War re-enactor...... who represent a perfect breeding and recruitment ground for some form of fascism.