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By David Wallace-Wells

Opinion Writer

The San Francisco Bay Area is home to at least one-third of the value of the entire U.S. stock market. Late last year, you couldn’t escape a chilling billboard campaign, meant to be cheeky, from an artificial intelligence start-up: “Stop Hiring Humans.” And on Saturday, somebody tried to AstroTurf a trollish Billionaires March through the city in defense of Silicon Valley’s 21st-century robber barons. Only a few dozen people showed up, heckled along the way by passers-by.

The billionaires themselves also seem to be on the move. In recent months, Mark Zuckerberg, Larry Page and Sergey Brin have all........

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