Correct me if I'm wrong, but Israel does not have the capacity to destroy Iran's nuclear facilities.
We don't really know. Publically-available information, it would seem not, unless they get a re-supply of a bunch more U.S. bunker-busters and/or the MOAB type things it seems they don't have already. "Publically-available information" is kind of key though, every state has some secrets & aces up their sleeve. They don't acknowledge they're a nuclear power, I don't see why they'd have loose lips about whether or not they have capacity to hit underground stuff.
There's also Stuxnet type options, and that was years and years ago, you'd have to figure that program/research wasn't just put on ice and there's probably newer & more devastating versions of that stuff to work with.
I don't think they're gonna hit the nuclear sites, but wouldn't be at all surprised if they *could*. Whether that's oldschool with the boom-booms or something more surgical & sabotage-y. All-in all it's probably gonna be more "Joe Biden wants 'proportional'? Okay, 200 of our actually-capable missiles zoning in on whatever Guard bases are nearest Tehran" type of thing.
And Scott, wait, what? *Hezbollah* can afford to absorb losses but the IDF can't? I get your point about recruiting, that more low-level guys will take their place in time, that always happens. That neither means A) you don't bother killing them, or B) that the new guys are as effective/capable - training still takes time, and that's what these guys have been doing for years. The replacement guys never turn out to be as good, that goes for leadership as well. Al Qaeda still exists, Bin Laden's son's at the helm, and they're a nothing. The guy that's replacing Nasrallah in Hez is *no* Nasrallah and never will be. Nobody even talks about whoever took over ISIS/ISoI after al-Qurashi.
Hezbollah's also far smaller an organization than the IDF is. Your point about the vicious cycle of violence is absolutely on-point, but let's not pretend losing 14 guys, or even 1400, is going to break Israel's will or whatever. A lot of the public doesn't like Netanyahu, but they're all on the same page that Iran and their little brothers need to be dealt with.