While I agree that there should be a secular, non-ethno-, state of The Levantine Union or something, there is no realistic path to that that doesn’t start from a two-state basis I don’t think. Palestine and Israel first need to comingle culturally and intertwine economically (in a mutually beneficial manner–not just Israel exploiting Palestinians for cheap hard labor) before any unification can really happen imo.
They’ll support Israel because the way we do it is another of the many infinite money hacks our MIC has created and entrenched deep into our politics. I really dislike this American trend to racialize the conflict. In virtually every way, Palestinians and Israelis, and Jews in general for that matter, are pretty indistinguishable but for small differences in otherwise very similar ethnic and religious cultures. Jewish culture, even across the diaspora, has been pretty clearly a Levantine originating one forever (not to mention the far deeper similarities between Judaism as a religion and Islam than between either and Christianity).