In the wake of the terrorist attack on a kosher market in Paris, Israeli prime minister Benjamin Netanyahu asked French Jews to come home.

I don’t particularly like that advice. I think it would be a tragedy if centuries of Jewish French culture had to die out because Jews were chased out by Islamist thugs. The French government agrees — for now at least — and has posted armed soldiers everywhere Jews live and gather.

Still, what Netanyahu understands is that there is strength in numbers. The more Jews there are in Israel, the stronger Israel will be. The flip side is that the fewer Jews there are in France — or Europe or America — the weaker Jews as a whole will be.

But no matter how you slice it, Jews are at a numerical disadvantage. [...]

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