[WesternWind]

Probably because of the high number of civilian deaths in a much shorter period.

Adults are harder to split out into civilians vs combatants, so sticking with just kids, by the beginning of March, four months into the Israel Hamas conflict, there were about 12.5k children dead in Gaza and Israel (a few dozen Israeli children on October 7th, the rest are Palestinian casualties of war).

In Ukraine 15 months into the war only 1.5k children had been killed, (all Ukrainian).

Add to that that the US government is continuing to directly arm and support the Israeli government, whose attacks are killing those Palestinian kids.