If the European political "leaders" ..
[yes I don’t know who they really are either, Camermong et al, are nothing but powerless figureheads of the Great Scheme]
..actually want to stop these attacks DEAD in their tracks then the answer is to make European citizens responsible for their own safety and security and EQUIP THEM THUS.
But that wont happen as that would mean empowering the citizens and that means those European leaders would absolve their control over said populace.