Beheadings. Dismemberings. The world is turning into a horror movie.

The Islamic State immediately comes to mind. Terrorism is nothing new, but the Islamic State has amplified terrorism¡¯s emotional impact ¡ª perpetrating, boasting of and broadcasting atrocities ranging from the mass slaughter of innocents to staged, scripted beheadings.

It knows what it¡¯s doing. The revulsion it causes does the group no harm, and the admiration it inspires drives would-be fighters to its side from all over the world. Many of these raw recruits, eager for training and a mission, are citizens of countries the terrorists hate even more fiercely than ordinary decent people hate beheadings and dismemberings. With a British passport a terrorist can infiltrate Britain; with an American one, America; with a Japanese one, Japan.