It's easy to believe the bullshit when that money machine is funding your six figure salary, free meals, unlimited vacation, recreational and health services, and 401K and Roth. That's why there are engineers at Google right now working on a censorship machine at the directive of the Chinese government. I find it highly doubtful that they would still believe the project is a net good on the world and not motivated by pure greed if they weren't getting paid so well. Similarly at Facebook.
Human morality is cheap and SV has showed that.