Having worked in tech for a few years now, it's pretty clear that Holmes is far from the only liar/sociopath/fraudster in the Valley. There's many just like her.
edit: As someone coming into tech from physical science, I have never seen the Dunning-Krueger effect anywhere like I do in tech. It's mainly in the management, but folks do have a very serious problem accepting expertise from scientists or engineers outside of tech industry.