Funny, I always considered it a keen insight and - perhaps - a prophecy.
Just kill them all. They say they want it.
They hate their other Muslims sects more than they love their children. In fact they kill their children if they marry into another sect or religion. Among many of them their is no love only bitterness and hate!
But once again, the world is reminded that this is no hyperbole. Its literal. The hate is deep and streams from generation to generation. They teach hate; they live hate; They pass it on to their progeny.
The true religion of peace tells us to love our enemies (darn hard I might add) and to be forgiving. Without those directives people will cling to the need for revenge going back centuries.