So if the numbers don’t matter then Hamas killing just one child justifies Isreal killing tens of thousands of children?

If the numbers were reversed and it was Hamas killing tens of thousands, would you be just as indifferent to the numbers?

I think you don’t care about the numbers because it fits your world view of Israel is right and Hamas is wrong. Excessive killing by Isreal doesn’t matter because they’re right, but if it was excessive killing by Hamas (and 3000 is excessive under normal circumstance) matters because Hamas is wrong.