If Israel's nuclear power plant comes under fire, if Tel Aviv skyscrapers explode from missile attacks, if Hezbollah manages to turn all of Israel into a kill zone where there is no place to run, Israelis will panic like they haven't since the 1973 Yom Kippur War when it briefly appeared the Egyptian army might overrun the whole country. I wouldn't want to be anywhere in Lebanon while Israelis are actively fending off that kind of assault. No country can afford to be restrained while fighting for its survival.
Just ask yourself how you would have felt during the Cold War if Ronald Reagan or Mikhail Gorbachev said "SO BE IT" to nuclear war. I would have wanted to hide in my basement or go off-planet entirely. And I have a hard time imagining an American or Russian crowd roaring with applause and pumping its fists in the air in response to that sort of thing. That's just not how Americans or Russians thought about a nuclear holocaust. Israelis don't think about nuclear war that way either, nor do Hezbollah's opponents in Lebanon. The same is almost certainly true of the millions of Iranian citizens who brave beatings, arrest, and worse to yell "death to the dictator" in the streets of Tehran.