I'm glad that somebody is making this point. I would not say that the fact that humanity is still here means that MAD between the US and USSR during the cold war worked. The US and Russian still have about half the # of nukes they had during the height of the cold war - meaning several thousands, on each side. They are still pointed at each other and on hairtrigger alert and I think these two arsenals are the most likely means by which humanity will come to an end in the next few decades. Having said that, I'll note that no other nuclear power, Israel included, has anything on the scale of what the US and Russia have currently, nor is Israel or Iran likely to ever build so many. It's simply too expensive. 15 trillion dollars is roughly what the US and USSR spent in 1980s dollars to build up such huge arsenals. Israel's 100 or 200, suplemented with perhaps several tens of fission bombs from Iran might make an Israel-Iran MAD safer than a US-Russia MAD.
Shaffir to Herzog: Opposition failed to show leadership in political battles against PM (Haaretz)
from the article: Let them have nukes