Seems many don't remember the violence of terrorism in all Europe during the 1970s and 80s. Certainly the UK with the IRA pumped the numbers, but Spain gave it it good try. 

http://www.datagraver.com/case/people-killed-by-terrorism-per-year-in-western-europe-1970-2015

http://www.telegraph.co.uk/news/2016/03/25/west-europe-is-safer-now-than-in-the-1970s-and-safer-than-almost/

Germany's  Baader-Meinhof Gang and Italy's Red Brigades forgotten in the mist of time.