Why do you think anyone in the USA give a rip about Israel and Palestine? Very few people are out there doing their own research. They are consuming what is put in front of their faces.
So for instance the Saudi "intervention" in Yemen is a great example of this reality playing out in real time. It's had hundreds of thousands of deaths and basically nobody cared, because the media scarcely brought it up. And the media rarely brought it up, because the US establishment didn't care. Relations with Saudi Arabia have completely tanked and they're fighting groups like the Houthis - so it was just a couple of "enemies" killing each other. Except now the Houthis have become quite relevant to US geopolitical interests, and so suddenly conflicts involving them become relevant to the US political establishment, and thus receiving substantially more coverage in the media.
You can see this quite clearly through a Google Trends query for "Yemen." [1] The Saudi "intervention" began in 2015. Internal conflicts in Yemen have been going on for far longer than that. Interest suddenly spiked in Yemen in the middle of October 2023. The Houthis began prohibiting Israel linked traffic through the Suez Canal on October 19th.
[1] - https://trends.google.com/trends/explore?date=today%205-y&ge...
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.