It doesn’t matter which Islamic text, whether it is a Qur’anic or jurisprudential text, or a text recounting the sayings of the Prophet Mohammad; the killers do not kill for nothing, they kill in the name of books, fatwas, ayahs and age-old tradition. All of these things are inseparable parts of true Islam. They will remain Muslims as long as they pronounce the shahada and as long as the religious institution doesn’t dare to modernize the criteria for being a Muslim.
These killers are us. They are our religion at its most extreme.