His ulterior motive was getting Muslims to not vote Democrat in November. He's been talking and strategizing with Netanyahu since before the election. So Bibi denied all of Biden's anemic efforts to push a cease fire because a hard-line racist Republican will be much better for him than a wishy-washy racist Democrat. It's similar to what Reagan did with the Iran hostage crisis.

That's because the whole thing is about geopolitics. Israel is practically a US military base. The Arabic countries are aligned more with Russia and China. This is why Biden didn't stop Israel and instead gave them more weapons. It was a show of force to neighboring Arabic countries while weakening their positions. While of course getting the ceasefire going is great for humanity, it's also good for Putin.

Disclaimer: I'm a conspiracy theorist that doesn't know anything about politics, so stop listening to me.