The spree of murders at several Atlanta-area spas demonstrates the unique threat posed by rampaging assailants. A new system that alerts the public during such attacks could help save lives.

With the demise of the Islamic State, a revived al-Qaeda and its affiliates should now be considered the world’s top terrorist threat.

Manifestoes about U.S. “decline,” have become a publishing juggernaut. But this literature is demolished in a beautifully written, persuasive new book from Bruce Jones, the Brookings Institution seni…