I don't think that's the proper use of poison pill.

Nukes are a deterrent.

Also, if you've got the firepower to level all of Israel and you haven't leveled all of Israel then you've proven you have no intention of leveling Israel thus any preemptive attack against you is plainly obvious to be the aggressor in the confrontation and then you can use nukes to defend yourself.

Without having nukes, Israel+USA can just claim you're about to get them and then you'll use them to destroy the world so they have to attack you to save the world.

Not having nukes puts you in the position to always be attacked whenever another nation feels like it.

Honestly, no country can survive in the modern age without nukes.