Certainly the terrorists manufactured and/or printed and/or delivered the "book",so to speak,but I think it highly unlikely they authored it.Far more likely the "authors" are alive and well and continuing to write lines for a script that may result in further,future acts of terrorism and violence.
No,I think the Pope was calling for prayers for many of us who unwittingly,with little malice or intent,support,for example,an NGO for refugees that require all women take birth control pills.This before they can access the antibiotics needed to combat their infection.
The Pope can only take every opportunity to invite us to look at ourselves through the eyes of Christ and ask us all to pray that God forgives and has mercy on those of us who may be blinded to our own complicity in evil.