One of the most important things to understand in geopolitics is that every country is a schizophrenic mixture of all kinds of priorities and actions.
“The Americans” have no single specific goal or policy with Israel. Biden has his priorities: Some amount of wanting to get reelected, some amount of wanting to preserve America’s alliances and priorities on the world stage (of which human rights isn’t any kind of priority), and some amount of actual concern for human rights. He’s chiefly responsible for the US’s behavior here and so policy is most directly a balancing act between those different things. But even there, his Israel policy is also at the mercy of congress which has a variety of other priorities, fear of the voters who may have wildly “extreme” priorities on one end or the other of the scale, etc.
The defense lobby that wants as many wars in as many places as possible, supplied by the US, and for them to go on as long as possible is certainly not an unimportant factor in that equation but it’s not the only factor.