Historically, almost any US politician who didn't give full enthusiastic support for whatever war crimes Israel wanted to commit would lose their job because of AIPAC. That doesn't seem to be true anymore but old habits die hard.
The Mideast has a bunch of oil and we like to go on little military/covert operation adventures there that coincidentally end up with leaders in place who want to sell it to us for cheap. That means it's pretty useful to have a no-questions-asked stable ally on the ground there; we have some others, but they're not as reliable or permanent or beholden to us as Israel is.
IDK if you've noticed but worldwide human rights is not a real big priority to the United States government 😢