Your logic is flawed as their was never Country A. There was Empire A's mandate under the UN that included land that Country B was formed out of. When Country B was created, all the country's around it decided to try to drive them into the sea rather then work to create separate Country A and Country B. Also add in the Country A's people's traditional homeland was in the western part of Country J, not where Country A / B is. Do forget that Country B's neighbors would rather have Country A's people living without a country as it provides the dictatorships in these countries with issue to inflame their own populace away from the general crappiness of these countries.
Yea, trying to portray Israel as a villain only works in a vacumn....