Correlation doesn't imply causation. Authorities on topics making errors get reported on more often because it's news. They also have more responsibility to be correct; the alternative to authority isn't truth, it's people taking wild guesses without the benefit of training. They are wrong more often, and they don't tend to make newspaper inches without that error causing some disaster because it's expected that people spouting off in a field outside their expertise would be wrong more often.

Nobody is systematically fact-checking HN comments, for instance, because none of us are assumed to be authorities on anything. ;)

A President, in contrast, is supposed to be an authority on, at least, the Constitution (or at the least, to know when their expertise is lacking), as he takes an oath to uphold it. The current President is demonstrably not (multiple EOs overturned by the courts are evidence of this). And his threats against Twitter show an extremely disturbing willingness to abdicate his responsibility to uphold the First Amendment. If the media is being hard on him, it's because they're doing their job; his behavior admits scrutiny beyond the extreme scrutiny his office alone already admits. When not even the Federal Election Commission agrees with the President's grandiose statements (https://thehill.com/homenews/campaign/499890-fec-chairwoman-...), the media is asleep at the wheel if they aren't fact-checking him.

Correlation does not imply causation. I hypothesize problems increasing while we've had Presidential Presidents (and to my memory, we've only had the one type!) isn't being caused by Presidents; it's caused by the world becoming increasingly complicated as systems interconnect, economic engines get larger, and money, people, and information flow more swiftly. I know some people believed electing a "non-Presidential President" might generate a different result, but honestly... Are things, on net, better now than they were in 2016? Not even the economy is on an upswing anymore.