Iran could not use one Nuclear weapon. They would be destroyed!
Nobody really knows what they'll do, but no one with any brains believes with any conviction that they would be have more or less rationally in the way the Soviets did.
The earlier poster who objected to the comment about the Russians loving their children being irrelevant was wrong. Believing that the US would massively retaliate if they used nuclear weapons (even indirectly), they were not willing to see their own families destroyed. The Russians, at least as officially atheist Marxists, did not have any hope of achieving paradise by having the world blown up.
One cannot thus argue concerning the Iranian mullahs!
And a single nuke on Israel would prompt the same response.
So Iran kills 1000’s in Israel..then what? They have nothing left and are promptly decimated.
A single nuke is not an arsenal. It's just one BIG bomb. One shot. If anyhting with would be used to cause massive upheaval in the ME while at the same time resulting in unprecedented action against Iran.
I think even Russia and China would raise some eyebrows if Iran actually used a nuke.
You are way too complacent. No, Iran isn't going to nuke Israel tomorrow if they get nuke tech. They will, however, deter others from attacking them and position themselves to nuke Israel the day after tomorrow, instead. 5 or 10 years from now, millions of innocent people will die. They hope that "5 or 10" sound so much like "forever" to myopic politicians in denial, that they can get there safely. Because the last chances to stop them before they can nuke someone back, are oh, about the next 6-12 months. And nobody in the west is going to lift a finger in that time frame.
Only Bibi might...