It is easy to attribute Jensen Huang’s abrupt fall to his lapses in judgment — including his growing list of extramarital dalliances — but Nvidia’s woes are a symptom of a much bigger problem. Silicon Valley finds itself increasingly under the control of a handful of dominant chieftains and investors. And as these extraordinarily powerful executives grow closer to President Trump, the dark consequences of the wheeling and dealing are coming to the fore. These problems are serious, but they are hardly new. Through much of this country’s history, particularly…