Israel can't be overrun? In the Yom Kippur War they very nearly were and only President Richard Nixon's authorization of massive resupply kept that from happening.
Jews are leaving France because of Islamist persecution.
Jews opposing efforts to fight them in Iraq and elsewhere are deluding themselves and are ungrateful.
Israel can deal with conventional threats. I give Nixon a great deal of credit for his actions, resupply was important, and I think it was the most courageous pro-Israel action of a US President, because it was unpopular. Depending on whether you believe representations about Soviet intentions, as in troops in the air, a grave risk, though that part in America's interest. Many sources would say the resupply while important, wasn't vital, most supplies, particularly artillery shells were at about 50%, and the Arabs weren't going to last another couple weeks on their own.
France is France's problem. IMO French Jews under persecution should go to Israel, or go through the regular process to immigrate to the US.
Jews who oppose the war aren't ungrateful, they're wrong. Any more than American Jews who support the war are disloyal neocon Zionist traitors.