Douglas Murray attends a conference of Islam critics in the Netherlands, and says “We should fear Holland’s silence.”

Holland — with its disproportionately high Muslim population — is the canary in the mine. Its once open society is closing, and Europe is closing slowly behind it. It looks, from Holland, like the twilight of liberalism — not the “liberalism” that is actually libertarianism, but the liberalism that is freedom. Not least freedom of expression.

All across Europe, debate on Islam is being stopped. Italy’s greatest living writer, Oriana Fallaci, soon comes up for trial in her home country, and in Britain the government seems intent on pushing through laws that would make truths about Islam and the conduct of its followers impossible to voice.

Those of us who write and talk on Islam thus get caught between those on our own side who are increasingly keen to prosecute and increasing numbers of militants threatening murder. In this situation, not only is free speech being shut down, but our nation’s security is being compromised.

Since the assassinations of Fortuyn and, in 2004, the film maker Theo van Gogh, numerous public figures in Holland have received death threats and routine intimidation. The heroic Somali-born Dutch MP Ayaan Hirsi Ali and her equally outspoken colleague Geert Wilders live under constant police protection, often forced to sleep on army bases. Even university professors are under protection.

Europe is shuffling into darkness. It is proving incapable of standing up to its enemies, and in an effort to accommodate the peripheral rights of a minority is failing to protect the most basic rights of its own people.

The governments of Europe have been tricked into believing that criticism of a belief is the same thing as criticism of a race. And so it is becoming increasingly difficult and dangerous to criticise a growing and powerful ideology within our midst. It may soon, in addition, be made illegal.