“Perhaps it’s understandable that someone who regularly witnesses the horrific aftermath of shootings feels this way. It still doesn’t make her public policy opinions more valid or convincing than those of a columnist or a gun seller. Some doctors deal with ghastly vehicular injuries and the 37,000 car fatalities every year. Their work is also incredibly important, yet their experience does not imbue them with expertise on the mechanics of a steering wheel or best way to direct traffic.”