No one is cheering for dead children. The point is that it is nonsensical to compare them; the killing of Palestinian children is an intentional strategy as part of an ongoing genocide, orders of magnitude greater in scale than the killing of Israeli children, which occurs incidentally during the resistance to that genocide.

You are allowed to mourn for all of them, but you must notice that nearly all of who you're mourning are Palestinian. Did you also need black lives matter vs all lives matter explained to you?