Texas Gov. Greg Abbott this week honored Jack Wilson with a new award called the Governor’s Medal of Courage. Mr. Wilson, a voluntary security guard for the West Freeway Church of Christ, earned the award for shooting dead a gunman—six seconds after he’d opened fire—who had just shot and killed two members of the Texas church.

Most of America rightly regards Mr. Wilson as a hero who used his gun to save innocent life on that December Sunday. But apparently not Michael Bloomberg. At a campaign stop in Alabama before the New...