The US’s motivations are to maximize its power and profits, to think it is to keep the peace is naive. There are other, more economically valuable regions with conflicts in the world whose situations have higher probability of clean resolution than the Palestine conflict, so the US will focus on those instead until it is forced not to.
Anyway, there is no resolution to Israel/Palestine that won’t involve the probable demise of one of the two’s futures. Bloods being spilled and it will continue to be spilled.
Giving weapons to Ukraine wasn’t about helping Ukraine; it was about opposing Russia.
Israel is a strategic ally in the Middle East that also happens to have many high profile supporters in the US. There’s likely enormous pressure from within to do just about nothing and just let it play out.
Peace, unfortunately, is a conveniently flexible concept employed to conceal one’s motives and justify frivolous wars.