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"But it is only a matter of time before a non-state entity acquires one, possibly from an aforementioned state
Why? In 50 years of cold war and proxy war between the Soviets and the west the soviets managed to keep their nuclear weapons out of the hands to their non state clients. Other nuclear armed states would have every incentive to do the same."
The days of only two players (Soviets & the West) kept in detente by mutual assured destruction are over. Pakistan's top nuclear scientist sold information and materials to Iran and Libya. North Korea was helping Syria build an alleged nuclear reactor. Nuke know-how is spreading to more states with reactionary leaders and overt ties to extreme groups.
It is a big gamble for Israel to assume fear of reprisal or precise military strikes will stave off the nuke threat indefinitely. Especially when Israel's unquestioned military supremacy has been unable to squelch militant groups who fervently employ asymmetric warfare.
I see better security and stability in seeking a single integrated state.