Dear Mr. Security Agent, Federal, state, or local. You, the man or woman with the badge, the sworn LEO or FLEA and those who inhabit the many law enforcement niches in between and on all sides. This essay is directed to you, because in the end, how this turmoil about gun control turns out will depend largely upon your decisions and actions over the coming months and years. I sincerely wish that members of Congress—who may soon be voting on new gun control measures—would read this essay, but I realize that’s a pipe dream, considering the impenetrable bubbles around those...