The juxtaposition could hardly have been more jarring: after completing today’s post, at morning break the lead story reported the attacks in France. In the worst violence since WW II, in coordinated attacks jihadists murdered as many as 120 people at three separate locations.

The reference to WW II is notable in revealing how much the world has changed. In relative terms, civil war and ISIL’s terrorist opportunism has brought Syrian suffering comparable to that of European populations during WW II. However, where indifference allowed Hitler to spread war across the continent from 1938 to 1944, cautious intervention in support of the rebels coupled with airstrikes and economic isolation has limited the spread of violence from Syria. As a result, to date the net cost to France of its intervention in the Middle East is tens of thousand of times fewer deaths than it suffered in WW II.

The natural…