The crux of the matter is not the casualties inflicted by Israel, not directly. If it were just numbers of casualties, then Hamas's horrific attack wouldn't even register at this point (2000 victims compared to 35000). Even if it were about percebtages, Hamas's brutal attack on October 7th wouldn't be far from Israel's operation (about 25-35% of the victims of Hamas's attack were IDF personnel, if I recall the numbers correctly; IDF is not giving any numbers about their Hamas VS civilian calculations, but comparing their published numbers of killed militants with the available casualty numbers suggests at best a 50% rate, though likely much worse).
Instead, the case is mostly about intent, and that can be gaged from public declarations and actions outside of mere combat. The case against Hamas is clear, they attacked in secret, with quite likely no military targets at all, and with a clear history of anti-civilian sentiments and declarations.
The case against Israel is also relatively simple from this point of view: numerous Israeli leaders, from the president to ministers to members of the Knesset have given public declarations about the collective guilt of Gaza's civilian population, and their actions in preventing aid from entering Gaza, attacking refugees, attacking journalists and international aid workers have been thoroughly documented.
Instead, the case is mostly about intent, and that can be gaged from public declarations and actions outside of mere combat. The case against Hamas is clear, they attacked in secret, with quite likely no military targets at all, and with a clear history of anti-civilian sentiments and declarations.
The case against Israel is also relatively simple from this point of view: numerous Israeli leaders, from the president to ministers to members of the Knesset have given public declarations about the collective guilt of Gaza's civilian population, and their actions in preventing aid from entering Gaza, attacking refugees, attacking journalists and international aid workers have been thoroughly documented.