You can't know that, there's only one source in Gaza that can give death numbers, and that's the Palestinian "government" ( iirc their health ministry). Maybe the numbers are inflated, maybe some of the deaths are due to Hamas actions and not Israeli. Maybe.

In any case, Israel is striking Gaza, and civilians, people, including children, are dying. Is that OK for you because Hamas disregards human life, including Palestinian lives?

And like i said, Hamas have nothing else they can do besides violence. Palestinian people, living in an open air prison or as second class citizens, and being expelled for Jewish settlers, can't do anything to stop any of that. Is it any wonder some, probably the majority, support Hamas? What's their alternative? Accept Israel has won and leave their own lands for illegal resettlement? Hardly a great choice