"If it's such a big conspiracy, why doesn't anyone on the inside speak out about it?"
Well, despite all the punishments in place to prevent such disobedience, it turns out some insiders do elect to speak out about it. Here's a former insider from the mass media (CNN) who discovered the ugly truth and turned whistle-blower, getting fired in the process (which is one of the potential punishments).
Interview #1Interview #2Interview #3