What I mean is that same ethnic groups may be more inclined to seek diplomatic or peaceful means than 2 groups of different backgrounds. Reasons being that groups of same backgrounds have more in common will share also greater familiarity.
As for the rest, I do think the Western backing have a strong influence. Weapons, for example, would have been one major thing. Without the West, the Israelis won't be flying F-15Is and etc.
Doubt it, how do you explain North and South Koreans? And the Chinese was killing each other with great enthusiasm during the civil war not so long ago.
Without West's backing, they would not survive beyond the year 1960. But since West did help them then we have today's situation because of Israel's own policies, so that make the whole point moot, but if today if they wants, they can single handled destroy the whole Middle East military.