Well, under the circumstances he has to do something, and this seems like a good call to my limited understanding. This is a small number of disaffected extremists, that ISIS and other actors have figured out how to activate so to speak. (Egged on by Nazi extremists as well.) A job for crack police and intelligence assets to root out. Unfortunately, the root cause of this horror, the endless European wars and propping up of criminal regimes in the Middle East/North Africa, probably won't get addressed. We're not really an intelligent species.