There is deeply ingrained in the Semitic peoples - Jew and Arab both - the idea of the blood feud; for as long as Semites have been stealing water from each other's wells, cutting down each other's Olive trees or poaching each other's goats the blood feud has ruled their behaviour; they bristle with righteous Abrahamic indignation snarling 'An eye for an eye!' at each other and reach for their weapons. The blood thus spilt requires revenge. The blood feud is self-perpetuating, and can last hundreds or thousands of years, so long as there remains a blood-debt to be paid. This is the nature of the beast.
I confess to little sympathy for either side in this current flare-up. Their feuding is as old as the hills that surround them, and will continue as long as any of them survives. It requires an endogenous enlightenment of the scale and impact of the European first and second enlightenments to break them out of this spiral of mutual destruction, and this seems to be a thousand years away.