I posit that it is because disparate people are able to find a common rage. They bomb the West because the West continues to bomb the world. Why did Orwell go and fight the fascists in Spain despite being English? Because you fight for what you believe in. In a global world people are more able to connect than ever. Thus people of various origins decide to get extreme in the face of an ever more extreme West.

You are in denial about this quite obvious connection. Until you listen to people and stop using violence yourself terrorism will only ever rise.

On a microcosm it is somewhat like the forum. There can be peace if people take the time to listen to one another and compromise, but while you all troll each other it will only create more conflict. War on terror and terrorism is trolling taken to a gruesome level.