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.
I expect those two categories to behave differently from one another. Do you?
And that is also what we see.
When did IDF try to outdo the rape of Nanking?
When did Hamas follow the laws of war ever so slightly?