They found it plausible under a standard presumption that all facts alleged were true. South Africa’s complaint is filled with circular reasoning and citations to sources that don’t say with South Africa supposes they say. Such as article after article of unconfirmed reports.

Plausibility is not probability.

Kids die in war. Yes, it’s very sad, and I see how upset you are. We get it, you must be a very good person. I’m sorry Hamas made the news so upsetting. All this horseshit you’re talking about me being some person who thinks 12,000 kids deserve to die is you being small and emotional.

Hmm. The international tradition on allied leafleting is that is was a war crime? That’s interesting. And yet it wasn’t a war crime that anybody got hung for, is it? Probably has something to do with the allies not being the people who put kids in harms way. Gaza could have kept to itself or elected someone other than Hamas (who immediately cancelled all future elections) and it would have been a post-Arab-spring young developing nation right now. We could have done as we did when South Africa finally came around, and sent our best and brightest there to help draft a new Constitution. Instead it chose a religious dictatorship to whom the concept of a written constitution of laws is religious infidelity, punishable by death. Instead, Gaza chose suicide bombings, mass shootings of civilians, and Hamas® brand Martyrdom,™ aka “instead of evacuating let’s all have family gatherings and silence our cell phones so we can protect our brave Hamas heroes hiding under our house!”

You can take all 12,000 kids and put them right at the foot of Hamas’s leadership of Gaza. I’m sure they’d have of “oh no it’s the consequences of our own actions” before they revert to your logic of “why would Joe Biden do this?”