A century ago it was the West’s great blunder to think it would not matter if Lenin and his confederates took over the Russian Empire, despite their stated intention to plot world revolution and overthrow both democracy and capitalism. Incredible as it may seem, I believe we are capable of repeating that catastrophic error. I fear that, one day, we shall wake with a start to discover that the Islamists have repeated the Bolshevik achievement, which was to acquire the resources and capability to threaten our existence.