[20 megatons a few times would clear up this issue.]
An Israel that balks at cutting off Gaza’s water is not nuking anyone. Heck, it won’t even execute Arabs arrested for terror attacks, and has not changed its laws on this even after 10/7. And unlike the US, there is no ban on retroactive legislation. That’s how Eichmann got his neck stretched, after being abducted from Argentina, at the ripe young age of 56. Paradoxically, the guy might have lived longer in Germany, where Germans voted to repeal the death penalty just so their vilest butchers would be spared, and even multi-decade prison sentences were whittled down to a single digit number.
https://www.washingtonpost.com/archive/opinions/2005/06/04/the-paradoxes-of-a-death-penalty-stance/d9815e20-5457-4b5e-b2ff-f451ca6d1734/