I was grilling some burgers and hotdogs for my family on Thursday, and I ran up to the supermarket because I needed more buns, some potato salad, and other things that I never remember I ran out of the last time I had a cookout. I drove the three blocks to the market, hopped out of my car and was greeted by the sight of a middle-aged white man strapping a shotgun on his back and walking into the market just ahead of me. My initial reaction was irritation. Why is this guy bringing an apparently loaded firearm into the grocery store at 6pm on a Friday? Is he trying to intimidate people? Trying to make a political point? I wanted to go to the store manager and register a complaint, but I found it hard to call up my rational objections to carrying loaded guns in public places (objections…