Tashfeen Malik is pictured in this undated handout photo provided by the FBI, December 4, 2015. U.S.-born husband, Syed Rizwan Farook, 28, and his spouse, Tashfeen Malik, 29, a native of Pakistan who lived in Saudi Arabia for more than 20 years, died in a shootout with police hours after Wednesday's attack on a holiday party at the Inland Regional Center social services agency in San Bernardino, about 60 miles (100 km) east of Los Angeles. REUTERS/FBI/Handout via Reuters  ATTENTION EDITORS -  FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS

Thou shalt not kill!

The most basic human moral responsibility is to train people not to murder each other. It appears that we are increasingly failing at this task.