It would be only just if the Palestinians would get their own state after this.
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The current situation is like somebody commits a murder. Then the community rounds up a posse and goes out to kill the murderer. Then kill the murder's family, their neighbors, the residents of the next neighborhood over, raze the neighborhoods and then take all the land for themselves.
Justice means penalizing the guilty parties, not everyone in their geographical/social group. Your definition of Justice is leaky.
It's important to note that these things never happened, and you're still repeating them years later. The only baby that died on 10/7 was a 10 month old hit by crossfire.
I have no idea of the third, and though I feel sure it's wrong judging by the rest of what you have said, I feel obligated to check. Try it.