It can get much worse
By 
Even on the narrow issue of Israel/Palestine, Trump would be much worse than Biden. What you want to do with this information is up to you. But Donald the Dove arguments about Gaza are embarrassing even by that country-fried-rube standard:
But beyond these considerations, the overwhelming feeling I’ve observed by some on the left is, “How could get it get any worse?”
If there is one lesson in life, it’s that it can always—always—get worse.
Trump has recently been portrayed in the press as being more critical of Israel than in the past, in part due to his personal dislike of Bibi Netanyahu for snubbing him. But this image doesn’t really hold up under any scrutiny. In March, Politico ran a piece with the headline “Trump used to brag about his support for Israel. Now his criticisms are growing sharper.” The evidence given for this are some remarks in an interview. Trump said Israel had made a “very big mistake” and had bad “public relations.” But what he was saying is that Israel ought not to have allowed images of the invasion to be shown, not that they ought not to have done the things shown in the images. He says, “Go and do what you have to do. But you don’t do that. And I think that’s one of the reasons that there has been a lot of kickback. If people didn’t see that, every single night I’d watch and every single one of those… And I think Israel wanted to show that it’s tough, but sometimes you shouldn’t be doing that.” The “That” being showing what’s happening: as usual, he’s totally focused on appearances. In the same interview, he goes on to say AOC and Rashida Tlaib “hate Jewish people.” This is not exactly someone who is now tacking to the left on Israel. Oh, and by the way, the interview itself was with Israel Hayom, the right-wing Israeli rag funded by Sheldon and now Miriam Adelson.
Let’s also consider the consequences of Trump’s foreign policy with respect to Israel and Palestine. Allow me a Trumpian locution: Trump is the worst president we ever had on Palestine. That’s because he basically understands nothing about it and doesn’t really give a shit about it. What opinions he does have are guided by reflexible Islamophobia. And because he doesn’t care that much about it, he defers to people in his circle who actually do, who are either fanatics or amateurs. People like his ambassador to Israel David Friedman, once an attorney for the Trump organization, who has strong ties to the settler movement and organizations opposed to a two state solution. Or the Adelsons, who basically shaped Trump’s entire failed approach to the region. Or, Jared Kushner, his idiot son-in-law whose main qualification in this area is that he happens to be Jewish. (I think this is literally how Trump thinks: “Oh, Jared can do it, he’s Jewish. Oh, get David for it, he talks about Israel a lot. Israel guy. Oh, Sheldon, told me this, Miriam, told me that.”) These people are not diplomats, they are not spies, they are not statesmen, they are some schmucks off the street. That’s exactly who you are voting for when you vote for Trump: Schmucks off the street.
No wonder then that Trump’s “peace plan” for Palestine and Israel, created under the auspices of Kushner and Friedman, was a total farce: a two-state solution in name only that basically relegated the areas reserved Palestinians to permanent Bantustan status and set the groundwork for annexation of large portions West Bank. It’s true that previous administration have by and large failed to stop the expansion of settlements, but Trump’s administration actually gave them its blessing and stopped treating them as illegal, reversing years of U.S. policy. And does everyone just forget that he moved the U.S. embassy from Tel Aviv to Jerusalem, something we know now that Sheldon Adelson basically just paid for?
These arguments were bad in enough in 2016. After he’s actually been president, it’s just moronic. His stated view of Israeli/Palestinian relations is that Israel isn’t being nearly brutal enough, and that’s reflected in his policy. It’s not ambiguous.