It makes perfect sense. In a democracy your government (supposedly) represents you, thus the actions of your government are those you are partly morally responsible for and partly have some control over. If Russia or China is selling AK47s to warlords in Sudan, there's not much that westerners can do about it

> thus the actions of your government are those you are partly morally responsible for and partly have some control over

America has global force projection power. It has about as much influence in Gaza as it does in e.g. Venezuela or even, arguably, Iran.

Everyone has good reasons for why their pet war is the most central to our interests. I think it’s fair to accept that there are multiple good answers.

This is supposing that people only have an obligation to not cause harm, and that those who are able have no moral obligation to actively help protect those who need and deserve it. Kind of like the trolley problem, I suppose.