Well they should. We can count on this sort of activity to continue until the West does something decisive to change it. That ultimately means war, whether next month, next year, or five years from now. The longer it is evaded by propitiation, the more costly it will be. Britain will not escape the consequences in the end, nor will we, nor will the EU countries.
Bullseye.
Radical Islam WANTS death and war. They will continue doing things to provoke it until they get it. The only question is whether we in the West have the will to end the problem permanently.