The gun has long been called an equalizer. As in, “God made men, and Colonel Colt made them equal.”
My friends and colleagues at the Second Amendment Foundation have a new push for this theme: see it here. http://www.examiner.com/article/saf-launches-equal-gun-rights-campaign?cid=db_articles
The gun is a force multiplier. As has been noted in this blog more than once, it allows a handful of beleaguered black Americans to fend off larger numbers of Klansmen.
The gun allows the righteous few to hold their own against many who are doing violent wrong. Do a Google search for Elfego Baca. Wise modern gun experts from Don Kates to Tamara Keel have pointed out that if you want to know how warm and fuzzy it would be to have a world without guns, you have only to look back to the outlawry and oppression of the Middle Ages.