The simplest explanation of Biden's baffling blindness to how bad this looks is that the President has a master (or masters). There's someone who commands the President to support Israel, and the President obeys.
Presumably, after you get sworn in, you get taken to a quiet room where they turn the tape recorders off, and you get introduced to your real boss.
Conservative Presidents don't care, because they were planning to disregard the greater good anyway. But Dems in this position have to just make concessions, strive for X, Y and Z while also appeasing their elusive master(s).
Anyone disagree? Come up with a more plausible explanation. I'd love to hear it.