Somebody needs to do a PhD dissertation on that. How the massive killing of civilians (or massive terrorism) has been integral--not accidental--in the Zionist doctrine, and in the ruling ideology of the occupation state. The Zionist founders knew that they had to deal with the rage of the original inhabitants and with the categorical rejection of the terrorist state by the people of the region and beyond, and they as a result employ the killing of large number of civilians to instill fear and to ensure domination.