The Semites in the Middle East had been killing each other since the beginning of the Abrahamic religion.
For example: Cain killed Abel.
And if you want to refer to Bibi's comment on the Amaleks: well Amalek was the "Grandson" of Essau. And Essau was the brother of Jacob (the father of the Israelites). Yup, they were warring against each other back then.
And when the Israelites received their land from Jacob, they were killing and enslaving each other from the beginning, in order to better their own position.
