> It's like the American oligarchs want to weaken America, or at least are willing to do so if it means that they have greater control over it.

The capital holders want it under their control. The fact that it harms the state is a consequence they ignore, or worse, believe that other people will deal with. There is not thought given to how much harm will be caused, because the harm is seen as part of the process used to acquire that control. It's the sort of thinking that aligns with beating a dog to teach it not to bark and then ignoring the cataracts that form from the repeated blows.