While I was familiarizing myself with Mike Johnson of Louisiana, our new speaker of the House, news arrived of a uniquely American event, another mass shooting, this time in a bowling alley and bar in Lewiston, Maine. The details are characteristic: Kids were having a good time at youth night in the bowling alley when a white male opened fire with an assault-style, semiautomatic rifle with a high-capacity magazine. Despite Maine’s permissive gun laws—concealed carry is allowed without a permit—no good guy with a gun stepped up. At least 18 are reported killed and many more wounded. Which made ...