Okay I have read, re-read, and read it a third time. Possibly even a fourth time. To me, it sounds like you are stringing words together in an attempt to say something profound, but they are not making sense to me.
What "combination of factors" have led to the recent protests? - There is only one factor, which is primarily Israel's genocide and war crimes of the Palestinians that people are outraged by, and our govts being complicit in it, and turning a blind eye to it.
Right wing isolationism has grown amongst Democratic voters? - Dem voters are usually moderate. Isolationism is an alt-right populist ideology. How are they even related?
Anti-war message on the left - It is not so much anti-war, as it is opposition to oppression, genocide and war crimes. Infact the anti-war messaging is on the right, when they oppose aid to Ukraine.
You seem to be conflating various unrelated things. Just because they appear to be the same, doesn't mean they are.
Perhaps you need to clarify more.
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.
The next is both sides want to reduce American interference in other nations. The right due to isolationism as policy, the left due to humanitarian and imperialism concerns.
Finally even on the border the policy is getting mixed reaction. Local homeless advocates wonder how in NY the illegal immigrants end up in hotels while tent cities are expanding. Both there and in other cites.
While the end use of the money is in question, the fact of USA foreign policy denying them their wants are coming into play. And in the case of young people especially a shift away from leftist leanings is also emerging. They want what the parents and Grandparents have, and see no way to get it. While not being to even able to afford monthy bills. Then see the money going to places and are asking why?
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.
Watch both conventions this summer if the protests last. The GOP is going to have their own voter problems, although I expect the Dems to get it worse.
Get it now?