The problem here is on BOTH sides potentially. It is true that Islam indicates that the 'infidel', non-believer should be killed. I know for a personal fact having been given a promotional book about Islam by a practicing Muslim - who did not agree with the opening words of the book: "Kill the infidel, kill him." Those are the verbatim actual real life words. Kinda made me question Islam 'coz that means peace, not kill. This killing off of us infidels is being promoted amongst many of the fanatics and extremists within Islam.
Kind of reminds me of the fanatical Christians hurling abuse at the funerals of homosexual or lesbian folk. And the Israelis marching to promote the war against Palestine, or what's left of it these days. Or the Hamas marches demanding the end of the Jews. And Ukraine didn't do itself any favours over the last few years either.
We have extreme people amongst us who happily find any excuse to harm of kill anyone they have a mind to.
In the UK years ago the Brits found a good excuse to annihilate German cities with hundreds of thousands of civilian deaths. I have no sympathy for any serving military personnel who go and get themselves hurt in war since it takes at least two sides to argue and they are one of the sides with weapons that kill wherever they are pointed. The Germans had at that time, however, dreamed up, what seemed to them a good idea, and they slaughtered millions. There is no country with clean hands.
Islamic extremism is today's western media and government target. Western Governments and media are the target of Islamic theocracies. So why do both sides always keep killing civilians who get in their way? The West is as guilty as the East. The North is as guilty as the South. All kill civilians.
They are all terrorists. None has the right to drop a bomb amongst civilians. None has the right to point any weapon at a child and pull the trigger. The history of humanity is littered with the blood and bones and guts and brains of man spilled everywhere.
In fact - most of human kind are indeed terrorists - they end up supporting mad reasons to kill each other.
(Je ne suis pas Charlie 'coz he's rude to people and I have more intelligence than to go around deliberately winding up the people with guns - especially since we all know they will use them if provoked - and there ain't no such thing as freedom of speech anywhere - for example only here just ask those who promote child abuse - some stuff IS illegal and very rightly so.)