Early one summer’s morning in 1994, Paul Jennings Hill, a defrocked Presbyterian minister, gunned down a doctor, John Britton, as he arrived for work at an abortion clinic in Florida. Unrepentant by the time of his execution nine years later, Hill (who I really don’t recommend Googling) was associated with the Army of God (ditto), which urges the murder — or ‘justifiable homicide’ — of abortion providers in the United States.