Don't quote me on this but I remember reading somewhere that Israel had a retaliation policy that included language in the effect of:

If Israel were to under ANY nuclear attack, they would respond by launching a simultaneous nuclear attack on ALL of their enemies.

I believe the point of the language is to also serve as a deterrent to keep Israelis enemies from launching an attack from unknown origins. It also passes the responsibility of keeping the Middle East nuclear attack free from some countries to every country.

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"When two people agree on everything, one of them is not necessary" - Arliss