Of course not all are but at this point in time you see these headlines and you already know where its heading; not all are, but definitely too many.
When ISIS first popped up, it was a rude awakening to see just how many people were prepared to up and leave Europe (and even here in Australia and other nations) and head off to join them. That so many people prepared to leave and take up arms in such a brutal and twisted society should have been a big warning. Since then, we've seen multiple attacks every year.
I'd love to be an optimist and say in an ideal world, Europe is doing the right thing, but in reality its just going to get worse. Sure your only seeing a small percentage taking the spotlight because of things like this, but even if its less than 1%, when you look at the over all numbers, thats still simply far too many