one deals with an existential threat by managing it. it's a subtle difference. regardless, if the american position is to "play ball" with whomever ends up in power, then it would have to apply equally to the results of saudi interests. it doesn't work out to a serious rift, either way.

i think what we saw a few months ago was the saudis throwing a temper tantrum for not getting what they wanted. the sanctions have not been eased. the united states has not asserted a more independent policy. the saudis have not been sent a message. the policy has not been altered. the differences do not constitute a rift; the saudis are merely being unreasonably demanding, and making a fuss about it.

the saudis do not need to blackmail the americans to stop them from being critical of their human rights abuses. rather, one would need to blackmail the americans in order for them to begin to talk like that! one only expects the americans to use that language to accomplish some military aim. rather, the united states has nothing to lose and everything to gain from an autocratic government in the region, and would recreate the status quo if it were to collapse.

it's been imperial british policy to install dictators in strategic areas for a very long time.