Well, Israel did support Hamas as recently as the early 1990s because they believed, for some reason, that an Islamic fundamentalist group would somehow be less hostile to Israel than a Soviet-allied revolutionary guerilla group would be.
Islamic fundamentalism has proven to be less of a threat to Israel than Arab nationalism, has it not?
That's a very good point. Islamism has thrown Syria into chaos, ensured that Egypt is busy at home, split Sunni from Shia, split Christian Arab from Muslim Arab, split Palestine and weaken any potential alliance against Israel. Of course the Israeli long term problem are if the Islamists win and/or if Israel succeed in alienate it western "allies". No matter what some Israeli thinks, there's no alternative sugar daddy other than USA
China? Or even Russia (I assume Moscow doesn't care about playing both sides)?
The difference is that right now Israel is in a relationship, where they wag the dog, while India, Russia or China could be potential future partners of Israel, these countries won't sacrifise anything for such a alliance, instead Israel have to give them something, and they can't expect the economic and arms support USA gives them.
Russia and China, both of whom have been strengthening its economic ties with Israel, are currently using Israel like a slutty college girl. It won't last and the Israelis know it.