Earlier quoted context omitted.
I think I read they were doing this in part to hurt Russian producers who would not cooperate with OPEC (KSA wanted to reduce production in a coordinated way). As a side effect this hurts American producers too and could drive them out of business. Which would be bad for energy independence and in the end give more price control back to OPEC.
I'm unclear how that's supposed to work. Oil goes below $30 for an extended period of time. So long that all the shale producers go bust. So long that no one buys up all those assets but instead just lets them go fallow. After all that time Saudia Arabia now lets the price rise. How much time will it be over $30 before the shale producers start up again? Will it really pay off compared to the amount of time they had…
I think that depends on how expensive it is to "start up again." If it costs $10mil to turn the taps on, then it won't be economic to do so unless the operators expect oil prices to stay above the $30 level long enough to make up the startup cost in operating profit.
From that perspective, an oil cartel could keep unconventional oil out of the market by holding out a credible threat that they'll crash the prices if ever unconventional oil becomes too big.