Most of the 'division' in America can be traced back to underlying differences that are evident in how the two groups view the second amendment, as you very eloquenly summarized.
Things will start to get intersting once the "domestic enemies of the Constitution" have a numerical majority, while the supporters of the Constitution have most of the intellect and work ethic in this country. The latter group also has more guns :-)
and the will to use them
Enemies Foreign and Domestic: 2005
Domestic Enemies: 2010
Foreign Enemies: 2015