If you see the major reason why terrorism getting famous is to expand the relegion population strength,to demo the power of them,Collection of more funds,Gain their internal profits(UAE safegaurds their oil wells from western countries),To Get Higher Pleasure in their Relegious Pratices and getting a feeling they are highest level people in the world.Friends,we should understand Islam means peace so we should help them grow and tell them to grow in good way.Not by only critizing them but also show the right path to them.One thing we can understand is every religion does these kind of thing,even much more than this like Christians also had terrorism in their religion,Check out Bible and Saints histroy of Vactican.But it tries to do more like this then it will become like Egypt Old -pagans and extinit away.All the best.