What exactly would the thanos snap remove? Like, the main thing that preserves Israel as a country is the violence that they use to enforce their borders and state structures, and the external supplies and support that they receive primarily from the US. Think of it like a balloon, where the skin of the balloon is the state's borders, the air pressure inside is the violence.

Would this thanos snap event just make all the weapons disappear? Because they would just get more arms shipments to replace it (pump more air into the balloon to reinflate it).

Your thanos would need to snap his fingers and make all of Israel's nuclear weapons disappear, because if they lost the ability to preserve their borders through force they would absolutely launch their nuclear weapons at everyone in the region. It is their nuclear doctrine.

If the Thanos Snap yeets all the Zionists... problem solved.

If the Thanos Snap continually yeets all attempts to make the state of Israel inside the borders of Palestine but leaves everybody (and everything else) untouched, cool.

If the Thanos Snap yeets Palestine, that's... that's not what we wanted.

In addition, what do you think the U.S. will do?

Christian Zionists would just revise their understand of apocalyptic scriptures and not need the temple on the mount to be rebuilt for their end of the world prophecies to come true.

The strategy to keep the "middle east" perpetually destabilized would probably be continued but with severely diminishing returns on investment. Maybe after a few generations of people living in a world where that area of the world is no longer in a constate state of "on the edge of a regional World War III" there probably wouldn't be too much support for destabilization efforts.