A San Francisco jury late last week rejected a $16 million gender-discrimination lawsuit against a Silicon Valley venture-capital firm. This triumph of common sense, though, represents merely a minor setback in the feminist crusade against America’s most vibrant economic sector. The chance that Silicon Valley can preserve its ruthlessly meritocratic culture under a continuing feminist onslaught is slim.

In 2005 plaintiff Ellen Pao got an MBA’s dream job: technical chief of staff to John Doerr, a renowned senior partner with...