You can’t put this on a few. It’s the genuine desire of the American voter.
They also think they are not always correct, not always unbiased, and possibly not always honest; and the bias tends to be towards either things that benefit the urban elite, or "luxury beliefs" that have disproportionate costs on other people.
Wouldn't economics and sociology PhDs have both more room for bias in their work, and tend to have power over the economy and society?
"Experts" have a lot of sway over the public sector and legal system.
The public sector has increased to take up a huge percentage of GDP, and the legal sector has also arguably expanded a lot in power.
The perception is that a huge amount of public spending is controlled by the public service, and they tend to defer to academics if the executive keeps them in line.