Its a truly terrible situation for Israelis and innocent Palestinians.
The world will be a better place when Hamas and its allies in Islamic Jihad are destroyed. I hope Israel succeeds in that. Hamas are a barrier to any kind of peace in the region, even among their own people.
Destroying Hamas et al will be difficult and will result in civilian casualties as a side-effect, just like D-Day, as mentioned before. But Israel needs to be careful not to lose support due to using Hamas-style inhumane measures.
My main problem with Netanyahus approach, though, is this...
Deliberately targeting civilians by turning off water and food is a war crime, and more befitting sieges of the middle-ages. It is not a military strategy, but one of terror. Collective punishment is illegal internationally. Only vulnerable Palestinians will suffer - Hamas terrorists won't as they will look after themselves first. It actually suits them for Israel to do this because of the effect of seeing children dying of starvation or dehydration which is exactly what they want the world to see.
Its entirely counter-productive for Israel. Even some Israeli media have taken to hammering Netanyahu for his approach, and questions his Govts suitability for office.
The world rightly condemned Russia for destroying the large dam in Kherson, Ukraine as a war-crime, and deliberately destroying a busy train station last year. That same 'world' needs to do the same regarding Israels actions with water and food, and pressure them to relent on this tactic.
The Palestinians and Israelis will need to accommodate each others existence, most likely in a 2 state solution. Hamas/Iran don't want this to succeed, so its in Israels interest to separate the Palestinian people from those who don't want a settlement. Starving them of water won't help.
The real power behind Hamas - Iran and allies, are just sitting back and watching Netanyahu mess this up.