History geek that I am, one of my favorite podcasts is BackStory with the American History Guys. And in light of current events, I highly recommend their 11/16 episode: "Straight Shot: Guns in America."
It's an illuminating discussion of the history of guns in America, and the relatively recent prominence of the Second Amendment. I especially recommend the first segment, which points out that, contrary to popular myth, "Wild" West towns like Tombstone and Deadwood had some of the most restrictive gun control laws in the nation. In most of these towns, you were required to check your guns at the sheriff's office upon arrival. In fact, that's what made the shootout at the O.K. Corral so infamous: shootouts like this were so rare.
If you're interested in a bit more historical context than the bullshit fantasy gun nuts spew in the comment threads, it's well worth a listen.