not defending the 40k number by any means because no one really can source its information correctly, but the reason why a decent chunk of the deaths in palestine are children is because the average age of Palestinians is very low (~18), so in terms of wiping various buildings down via explosives statistically speaking, there will be people under 18 in that explosion.
how many of them are under 10 will be a TBD state till after the conflict, but its definitely reasonable to assume a chunk of minors died in the conflict simply by law of averages and how the targeting is done.
yes, the mmo at launch was a huge flop, so much so that the newer version of it kind of makes fun of the old world that was destroyed.