The slaughter at a gay nightclub at Orlando, by a gunman who authorities say had sworn allegiance to the Islamic State, underscores the fact that a victory in the war against Radical Islam is an American common interest. It may be too soon to tell the exact motives and affiliations of the killer and to what degree he was a lone wolf. But it’s not too soon so say that it doesn’t matter what one’s religion, sexual orientation, or race. Nor one’s politics. Christians, Muslims, and Jews, agnostics, and atheists, no matter their background, are natural allies in war against the radical brand of Islam that would countenance this crime.