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.
The crimes of Hamas are well documented, not only by Israel who admittedly might have some bias, but also by several in the OSINT community before Hamas realized their mistake and started deleting.
You questioning it only tells us you don't know much about what happened.
> the argument would be to punish Hamas, and not run around shooting children in the head,
Exactly like we dealt with the nazis and not a single child was hurt, right?
Or maybe take "war 101" and "war 201" and learn a thing or two about both why the laws of war explicitly bans using civilians as shields and also explicitly point out that human shields can be ignored. (Yes, it does. Feel free to look it up, and as homework, consider why the laws of war points this out ao explicitly. Here is a link, I don't expect you to have tje laws of war bookmarked: https://ihl-databases.icrc.org/en/ihl-treaties/api-1977/arti...)