Probably mainly smoke and mirrors. I've lost count of the number of UK stories where some terrorist or criminal was known to authorities, or already on a watch list. They never manage to catch or prevent despite all these huge surveillance programmes. Then the news almost inevitably follows up that they've found out there were public exchanges of messages on Twitter 2 days before the incident or some such.

It would be comical were it not for people dying.

My take is it's utterly irrelevant. The chance, even with Daish and current events, of dying in a terrorist attack are less than by falling off a ladder. Something like 20 times less. It's firmly down there with the silly and odd causes of death. I see no war on ladders.