What can they do now anyway? The population there is what now, 20% muslim? Pretty big number to "filter away" a few pyrotechnists, even with all the intell. They keep proving how easy it is to get weapons, manufacture explosives and transport them in front of authorities. A huge problem that the "age of information" has brought upon.
Arming the population? Right to bear arms? What the hell. How is that a safety measure of any sort? How delusional can one be to think that it is a proper measure, preventive or not?
The only way this crap will ever end is if the IS loses any interest in blowing themselves around Yurop, and stick to only assplode on their own corner of the planet, while we hope they eliminate each other eventually. Anyone with a minimally functioning brain knows this will never happen due to many "interests" on both armed conflicts and resource claiming.
Or if zombies happen. Damn that'd be fucking cool. Zombies, man.