Hartmann, the 2nd Amendment and slave patrols

In this article Hartmann lays out how slave patrols were the "well-regulated militia" in the south, which were used to round up runaway slaves. He cites Carl T. Bogus' work "The hidden history of the 2nd Amendment," as well as Hadden's book on slave patrols. Here's Bogus discussing the topic in 2013, where he concludes: "And, yes, I remain convinced of its thesis."