You're overlooking facts in a way that serves the Israeli narrative and calling opposition to crimes against humanity as "moralizing about being mean". I don't wish to engage with that nonsense (I wonder if you were similarly unimpressed when John Kirby moralized about the Russians "being mean" to Ukrainian children), but lest someone be inclined to believe it:

- After invading their territory and forcibly displacing them from their homes in 1948, the Israeli government would eventually imprison 2.2 million Palestinians in Gaza, severely undermining or outright depriving them of their right to food, movement and labor. Rather, the question is why would the Palestinians welcome an militarized immigrant movement whose stated objectives included the total demographic overwhelm of Palestine, changing the "facts on the ground", supported by an interloping British Mandate. This is as true now as it was then.

- So, while the IDF may be engaged in urban warfare with the armed wing of Hamas, their practical goal is the cleansing of the Gaza Strip, including the genocide of Gazans, evidenced by this past year's perfidy-ridden bombing campaign against civilians. (And the March of Return, and Operation Cast Lead, and Operation Protective Edge, and the bombing of the AP office, then the largest number of journalist assassinations ever witnessed... etc etc)

- Aware of the legal liability of this, the American and Israeli governments have been lying about these aims and attempting to generate plausible deniability by claiming the IDF is measured and surgical in their use of long range heavy bombs, and pretending the infinitesimal ratio of enemy combatants killed is Hamas-engineered. They redefine "human shield" and "Hamas combatant" to suit the moment.

- Of course we know that the Purpose Of a System Is What It Does, so nobody who is informed and in their right mind believes these soul sucking, sugar-coated "upper establishment" statements about due diligence or accountability or whatever and pearl clutching about hostages never mind the overwhelmingly higher number of Palestinian hostages taken and tortured by Israel. Despite their toothlessness, the UN, the ICC and the ICJ have allowed the world to show, one inconvenient determination after another, that the truth is plainly visible.

Ultimately, it's just whether they see war crimes when they see children and families being killed systematically, and whether they're cool with it.