The government of Israel are not liberal Zionists, so I don’t know why you bring that up even.
The government of Israel is not its administration. There’s plenty of people in charge all over the place which hate Bibi’s guts and Ben-Gvir thrice over.
This is not negligence. This is obviously willful intent. They’re starving two million people.
The argument will be that Hamas is stopping them from delivering more aid – and that’s not even false, Hamas is impeding aid. If Hamas wants Israel to get convicted of genocide they should not be the utter bastards to the civilian population that they are. OTOH, the argument “Then don’t fight that war you’ll just have to accept Hamas doing such stuff” doesn’t fly because that would go against the right of nations to defend themselves which is not negotiable, it’s a core pillar of international law.
Juridically this will all end in a headache of “what is proportional, what is not, and is us talking about proportionality even proportional to what Israel is doing”. The ICJ won’t be able solve this case for humanity, we gotta find that very thing on our own.