Why is the world so shocked at religious extremism? Religious extremism is supported by their doctrine. Just look at Christianity. To not believe in the Christian God is a sin. And Christians have been killing sinners for years.
Muslims are killing non believers too. And they often have their governments backing. Pakistan being the most obvious example with their liberal blasphemy laws.
Religious tolerance isn’t a value in either Christianity or Islam.
Religious extremism isn’t the real issue. Religious doctrine is. The Bible and Koran promote violence. They are the original source.
So the proper approach to curbing religious extremism is to curb religion in general.