How the tech industry got Donald Trump elected

The trend of middle class and blue collar hollowing-out and economic decimation began in the early 1970s. Find any graph of median wage, etc., if you need confirmation.

You can't blame SV for a trend that began 30 years before its rise to prominence as a major socioeconomic power. Automation may destroy huge numbers of jobs in the future (e.g. trucking), but so far its effect has been significantly less than offshoring and outsourcing. It was the opening of overseas labor markets that destroyed the American blue collar worker, not tech.

... and other industries have never been "civic minded." Workers had to unionize and struggle hard to get fair wages, good working conditions, vacations, and even weekends.