You don't have to check, more Gazan children have died than Israeli children. So by your argument, had Hamas killed more Israeli children then there wouldn't be a problem? I can think of no other reason why you made that argument.

  > Israel has killed something like 30-40x the number of civilians in the same timeframe.

You might notice that Hamas was in Israel for less than 1/40 the time that this war has been going on. So per time period, Hamas killed _more_ children than Israel, given the chance. Who do you accuse of genocide now? They've just been denied the chance.