Saudi Arabia is hostile towards Iran and friendly towards the US (and therefore at least neutral towards Israel).
We like to maintain countries that are hostile towards countries that are hostile towards Israel for obvious reasons (enemy of my enemy, etc), especially if they are good trade partners.
The Saudis sell oil to us, we sell weapons to the Saudis, everybody benefits.
Well, except for the poor sods who have to live in an abusive theocracy, but we don't care about brown people, especially if they live far away from us.
We like to maintain countries that are hostile towards countries that are hostile towards Israel for obvious reasons (enemy of my enemy, etc), especially if they are good trade partners.
The Saudis sell oil to us, we sell weapons to the Saudis, everybody benefits.
Well, except for the poor sods who have to live in an abusive theocracy, but we don't care about brown people, especially if they live far away from us.