I don't think the people conducting these attacks quite understand: on an individual level, for those directly caught up in the event, terrorism is as harrowing and tragic an experience as any other act of aggression, but collectively, no one here gives a sh*t. Why? Because Europe was the birthplace of Industrial Warfare. Random killings dont achieve anything. Small minded fools with delusions of grandeur who think killing a few civilians and then dying themselves will somehow benefit their cause are just seen as an irritation.
Take the 2005 bombings in London, for example. More people were pissed off because the Tube was shut down rather than because an act of terror had just happened in the capital.
Picking up a gun and shooting lots of unarmed people before you yourself are taken down doesn't make you special. Anyone can do it and at the end of it, youre dead, so the problem has essentially solved itself. The infrastructure youre blaming for all the evils in the world is still fully functional because its never military or industrial targets that are attacked. Its not warfare, its just random violence, and thats easy for a nation to shrug off.

http://jollyjack.deviantart.com/art/Naught-but-an-Irritation-572119364