Except, at least on paper, we all agree that there is a resolution that would be acceptable to both parties.
I suspect (as do many other leftists who have a more cynical view of american imperialism than you do) that Biden is well aware of what the right thing to do is, but doesn't want to be the one to give up the benefits of having Israel as a foothold in the middle east and is willing to accept a genocide in order to keep it.
If Biden ever made a strong case publicly on why Israel is such an important ally that we should ignore their atrocities, it would be impossible for any of us to miss it. I think we haven't seen that case being made because nobody who believes in the benevolence of the US would be happy with it.