It really doesn't.
What benefits the U.S. is stability in the region, and despite all the howls of protest you hear from around the world over the decision to recognize Jerusalem as Israel's capital, it will actually result in much more stability in that region. Establishing and protecting any area as part of a sovereign nation (even a hostile one) is far better than leaving it in some kind of quasi-autonomous state as a U.N. protectorate.
I would add that there is value to re-asserting American leadership on the world stage.
Right after the election last year, I was listening to Jay Sekulow’s radio program and they were discussing this move. They also got into something distrurbing that I haven’t seen mentioned, but I’ll bring it up. Jay said that not only does Trump intend to move the embassy to Jerusalem, but he wants to see the Jewish temple rebuilt. Jay said he’d had discussions with Trump’s team about it. It’s probably nonsense, but Trump thinks really big. There are few things he could do on the world stage that would have more significance than pave the way for a rebuilt temple. I can only guess at the fallout. I would like to go back and listen to everything Sekulow said. I’d dismiss it completely but Jay does have connections to Trump.
I will bless them that bless you and curse them that curse them that curse thee-——Gen. 12:3
The USA needs to do right by Israel!