After what happened at the Ariana Grande concert, it's not surprising that ordinary people will grasp at simplistic solutions - like keeping all Muslims out, and deporting those that are already here. Sure, that's unfair, but it's much, much, less unfair than being killed or injured in a terrorist bombing.

If those who refuse to give in to intolerance can maintain public trust, if they can convince the public that they are not so unavoidably wedded to political correctness that they will not fail to give due weight to public safety, the forces of intolerance won't win.

But things like the cover-up surrounding the robberies in Cologne will erode that trust, and will help the extremists take power.