How Should Israel Apply the Law of Armed Conflict During the Siege of Gaza?

The the law of armed conflict was created by Western nations after 2 world wars entirely to protect civilians who happen to find themselves in a combat zone, not to protect enemy combatants.

Under the internationally-recognized law of war, countries are required to 1) refrain from targeting civilians directly, and 2) ensuring that any civilians deaths that do occur from attacking valid military targets is proportional to the military advantage gained from the attack.

Israel has announced they have completely shut off electric and water from Gaza. Under the law of war, this is technically allowable because the power and water arguably makes an effective contribution to Hamas' military activity; they are headquartered in Gaza and need electric and water to plan military operations.

But this will also directly affect an estimated 1.5 million civilians who are stuck in Gaza, and must be proportional to the military advantage gained under the law.

Israel has obviously decided the harm to civilians in Gaza is proportional.

My question to the board: is it? What compromise can Israel take to allow relief to civilians while also ensuring Hamas is destroyed?

Many believe Israel has the obligation to immediately establish a human rights corridor to allow the immediate evacuation of women and children. This would, however, require Israel to devote resources away from the fighting and focus on the corridor, at least in the immediate future.