If the Establishment exists to promote the success of the American Experiment, why did the American Experiment do better between January 20th 2017 and January 19, 2021 than it has since under the control of the establishment?
You think 2017 to 2021 was a better span than, say, 1990 to 1995 or 1950 to 1955? That's beyond preposterous, bordering on mental illness. I also don't recall the "establishment" ceding control at any point. Most of Congress and the judiciary existed before that short presidency and continued to wield power after it.
