A powerful economic incentive continues to drive the nuclear arms race. After the Singapore Summit, the stock values of all major defense contractors — including Raytheon, Lockheed Martin, Northrop Grumman, Boeing and General Dynamics — declined.

Given his allegiance to boosting corporate profits, it’s no surprise that Donald Trump is counterbalancing the effects of the Singapore Summit’s steps toward denuclearization with a Nuclear Posture Review that steers the US toward developing leaner and meaner nukes and lowers the threshold for using them.

The United States has allocated…