People opposed to this particular war, are against it because it is a genocide. The protestors are worried about the Palestinians and the oppression, apartheid and genocide they are suffering. Many protestors are infact Palestinians, or are from Muslim nations, or are anti-Zionist Jewish people who feel personally about this.So ask voters one main reason they are opposed to the war is the cost. They are sick of sending 100's of billions out while their own nation is crumbling. And yes that is common on the left and right. The right want tax breaks, the left want more localized social services. But both are in agreement they want the money to stay home. Whether military aid, NATO, or over spending on the US Military. The obvious divergence on humanitarian aid, but I've seen the laft asking why we have homeless as well.
People are complicated. Differing forces can come together over common cause and enemies. Some of the associated Anti-semitism is right wing off campus agitators. Protests are not just on the campuses but online as well. The crowd outside the recent Press dinner was a mixed crowd. And people can and will state one reason they are protesting while holding personal and not necessarily as politically correct opinions as well.
When it comes to money the opposition is two fold.
A) The money comes from lobby groups like AIPAC that control and manipulate our governments in favour of a foreign state.
B) Consequently our governments not only help Israel at forums such as the UN by vetoing anything harmful to Israel, but also send billions in aid that is being used against the Palestinians.
So again, the call is to help Palestinians. It is however not a demand for that money to be used here instead for better social services. That is something the protestors may agree with if you ask them, but that is not what is in their minds when they go out there to protest, and it is not why they protest.
There are of course some far right wing individuals who also support Palestinians, but they don't hold any love for the Palestinians. They just hate Jews more. So we can disregard them as they are in the fringe minority.
I believe yours is an incorrect characterization of the motives of the protestors because you have conflated your own motives, with that of the protestors. If you talked to anyone who is pro-Palestinian the last thing you will hear from them is their worry that the govt. is not providing social services.