Blood. Time after time it looks like a bigger, more and more upsetting stuff. I suffer for the shot dead person in France as for the child in the blood in Aleppo being bombed.
But this is almost gradually approaching to recreate a war like scenario in the heart of Europe.
Collective conscience and feelings are hurt by this.
Next, this pollutes European ideologies. Inside the Parliaments as outside, in the streets.
If a potential outcast becomes crazed or fanatic over an extremist way of leading his life (eventually up to his own death), the vicious cycle won't stop.
On the other hand, I'm aware that even without fueled ideologies or xenophobia, this could very well happen - Spain, 2004 - London, Summer 2005.
But this time, the dimension of this kind of things is bigger. So is the aftermath. Emotionally, socially, politically...