How Evil is Silicon Valley?

As of late, tech giants like Facebook, Twitter, Amazon and Google, are being perceived as evil for taking advantage of our deepest, darkest secrets and fears with one goal: to make us click on more invasive ads. Tristan Harris, who has been described as "the closest thing Silicon Valley has to a conscience," is trying to change that. But can an industry worth trillions of dollars, with some of the biggest egos in business, ever change to do the right thing?