CSD attack in Berlin: what to think, what to do?

The attack in Berlin confirms the views of those who have long warned of the threat posed by radical Islam in Europe, writes columnist Jonathan Sacerdoti in The Spectator:

“Some of us have tried warning about this for some years now. We tend to get dismissed as ‘racist’, even though Islamist terrorists come from a variety of different ethnic backgrounds. We are smeared as ‘divisive’, even though we are mostly very inclusive people who are united with other lovers of freedom in our opposition to those who seek to divide (and kill) non-believers in Islam. They sometimes call us ‘alarmist’, even though we have plenty of frequent examples to draw on for our plaintive and urgent warnings.”