When we're told to “trust the experts,” what's usually being instructed is to trust today's experts. Think of how many of yesterday's “expert” opinions are now officially proscribed, ignored, or denigrated! Expertise, defined as such, is almost always a contemporary art, one that bestows prestige on its purveyors to the degree they prove useful to the power brokers of the day. Moreover, understanding that expert opinions are incentivized to align in their favor, these “power brokers” tend to be those most vocal in proclaiming their faith in the experts.
To maintain their title and credentials, experts must remain in the currents of the moment, learning to swim in them if they want to translate their particular expertise into contemporary status and power. As the waters grow more partisan, corporate, and absurd, a steep decline in the natural expert population rapidly occurs. However, this poses little problem for those whose narratives depend on catching experts in certain waters; they have just learned to stock them there first! Like trout born in hatcheries and later released into lakes and streams, experts now swim in waters that could never naturally support them and their positions.
Alas, I fear we are becoming sport anglers who no longer care whether we catch naturally occurring wisdom or just another stocked phrase!