Those are the most serious allegations: "The men and teenage boys were taken to a warehouse where they sat on a bare floor covered in scattered grains of rice. There they were beaten, interrogated and verbally abused. There was no sleep, and the grains of rice cut their skin as they sat there, undressed." A man claims: "Some people didn’t return from the torture sessions. We would hear their screams and then nothing.…
There are still rockets flying out of Gaza into Israel.
> 2. Its only purpose is to defend against the agression
The people sending those rockets are in Gaza, so to stop them, Israel has to go there.
> 3. The defense has to be proportionate
That one is regularly the most difficult point of contention in individual self-defense. Hamas essentially goes by this playbook: https://imgur.com/XX6HVrn
So, moving it back to individual self-defense (or coming to somebody's aid, which is covered by approximately the same rules): what should be done about the guy holding a loaded gun at his hostage's head while covering himself in babys?