This is common sense. It's astonishing that this needs to be explicitly stated on a site like this.
That's not to say that 30% isn't a crime against humanity. About 1.5 million children were murdered during the Holocaust (1.5M of 6M+ deaths). Israel murders more children than adults when compared to the Nazis.
I agree, however the claim is not war crimes, its genocide. People think that using genocide to simply mean lots of killing and destruction and war makes them morally superior, but genocide entails "intent" and we need a vocabulary to differentiate between the two.
Overall, intent is quite hard to prove. You would need to access internal documents and communications that explicitly direct the military. That's probably not going to happen.
However, from what I have observed, Israeli government officials have often expresses that intent publicly, despite claiming otherwise at the UN.
In this case it is fundamentally impossible, since halakha prohibits deliberate targeting of civilians-- but not collateral damage.
So if you optimize for collateral damage and all civilian casualties are "accidental," then you are wholly operating within the constraints of your moral framework and can plausibly deny all claims of genocidal intent.
I am sorry but did you look at pictures of Gaza?
Do you not see them actually CONCENTRATING the previously 2 million people there into a gigantic CAMP?
Adult men have the highest casualties which is what would be expected since Hamas militants are most often adult men, it's well documented that Hamas also uses child soldiers to some degree as well.
That's not to say that 30% isn't a crime against humanity. About 1.5 million children were murdered during the Holocaust (1.5M of 6M+ deaths). Israel murders more children than adults when compared to the Nazis.