The West is paying in blood for the folly of its politicians

As the shadow of violence lengthens across Europe, every week seems to bring a new round of atrocities.

In recent days the catalogue of blood-soaked incidents has been savage.

It includes the Nice massacre by immigrant Mohamed Lahouaiej Bouhlel, the axe assault on a train at Würzburg, Germany, by refugee Riaz Khan, and the stabbing of a mother and her three daughters at a French holiday camp by a Moroccan Muslim who took offence at their clothes.