The 16,000 and 6,000 figures are at the lower end of estimates which are considered valid by the UN and WHO.
There are always going to be challenges in accurately assessing how many people who have been killed count as 'combatants'. It will be biased by who's doing the recording of the deaths. Nobody is going to dispute that. But over 6,000 children is horrific. And I've yet to see any estimates of Hamas fighters that suggest that ratio of children:adults among fighters. Which means that the current strategy is disproportionately attacking children.
The most 'favourable' ratio of civilian to Hamas fighter deaths I've seen was 2 civilians for every Hamas fighter killed. That was given by a senior Israeli figure who considered it to be "positive". In war, as I've said, estimates get skewed by both sides, and this figure could be reached through, for example, including anyone male, or anyone who tried to defend themselves or their families when soldiers appeared and they feared for their lives.
As a thought exercise, imagine 3 people, unknown to each other, standing in front of you - to reflect the estimated casualty ratios, make one of them a child and one a woman - now, would you be able to pull the trigger on a gun and shoot all three of those people if one of them was deemed to be a combatant? Would you feel this was ok? This is what's being presented as a "positive" ratio of killing civilians. Many of these civilians have no affiliation with any 'resistance' or terrorist group. They're being killed anyway.
My colleagues did not deserve to die. My friend's family did not deserve to be bombed - nobody should have to pick shrapnel out of a baby's face themselves because there's no way to get to a hospital.
There must be justice for October 7th. What happened was abhorrent. Justice cannot come at the cost of the obliteration of Gaza, the deaths of thousands of children, and even more murder and oppression in the West Bank. Justice cannot be overwhelmed by wrath, or where does this end? The world needs to find another way.