The real Jewish reply - like the real replay of every group - was socialism. Everything else is hogwash.Doesn't the Western Left owe a great deal to Jewish writers & philosophers & theologians? (Indeed, doesn't Christianity owe a great deal - the Biblical Old Testament, for instance - to the same sources?)
Was Hitler a Leftist? Were the Czarist governments or the Soviet experiment made up solely of Leftists?
Why would the Western Left choose to uproot itself?
Israel is a country; & they make policy decisions like any other country - with a view to preserving the country into the future. That said, they face some political problems of their own making, plus the normal issues surrounding statehood in a variably hostile political environment. Does the state of Israel = the Jewish religion? I don't think it does; there seems to be more heated discussion about Israel's political & national future within the country than there is in say, Washington DC.
The Zionist project - a homeland for the Jews in Palestine - is a gamble. Before that, the Jewish response to pogroms & persecution was to scatter to more civilized countries. In Israel, the Jewish project is to build a homeland where all Jews are welcome. That puts many of the targets (of Muslim religious/political rancor, for one) into a single basket, close @ hand. It's a high-risk goal.