This is what West Wing brain gets you. The behind the scenes report about Biden was that he said he was going to help Israel without any consideration for how it would hurt his approval ratings, or whether Netanyahu would even show gratitude, because it was The Right Thing to Do ™. He probably pictured himself as Jed Bartlett and came his slacks while saying that, and now he's finally in a refractory period, sitting in the mess he's made on himself.
Biden's far too old to have ever seen The West Wing. That's an Obama staffer thing. But he for sure is huffing the same civil religion that Andy Sorkin was cooking.