If Syria’s despot is not punished, others will use chemical weapons

AFTER seven years of war and hundreds of thousands of deaths, it takes an act of utter barbarism to shock the world out of its indifference. But every so often, Bashar al-Assad supplies one. On April 7th more than 40 Syrians were killed with poisonous gas in the town of Douma. Videos showed men, women and children lying lifeless, with foam dribbling over their lips. Such horrors are why most countries outlawed the use of chemical weapons long ago—and why Syria’s despot flouts that ban. He has carried out dozens of chemical attacks over the course of Syria’s war, sowing terror in rebel-held areas. The world should not let him get away with it.