A whole lot of this, which seems to be largely lost in the shuffle/conversation.
Imagine that you are a kid in/from Gaza. Say, age 8-16. When this is over, and you are either in what's left of Gaza, or you are in exile somewhere....how much hatred and rage will you be carrying around inside you? If even a fraction of a percentage of those people conclude that vengeance against Israel and Israelis must be their life's work, that's a shitload of terrorists who aren't even motivated by a political goal (a free Palestine, what have you). No, they're motivated by a desire to inflict pain. Massive pain. Incalculable pain. Because that was what was inflicted on them.
If one of them someday gets the chance to deploy a weapon of mass destruction - gas, bioweapon, nuke -- against Israel, aren't they going to jump a the chance?
The chances of an existential attack against Israel in the next 20 years have gone UP, exponentially, as a result of this war. That's the maddening part. What Israel is doing isn't just cruel and evil, it's fucking counterproductive in the long run.