So if there is such a global conspiracy to hide the truth, why?
Lets take Boeing as an example. They have been secretly downgrading the quality of their product for years and until recently, no one knew. Sure, there was the occasional person who came forward but they were either silenced or labeled a crackpot.
Now, according to Wikipedia, Boeing employs over 170 million people. Do all 170,000,000 plus people need to be sworn secret carriers? Or do you think that the vast, overwhelming majority of them are just people doing their jobs as their boss tells them. Who are in turn doing their jobs as their boss tells them, and so on. It only takes a few people to know the secret and many of them may not even work for the company! Boeing's board of directors appoints a CEO and in many cases they are just the patsy who takes the fall. As is the case with Boeing's CEO Dave Calhoun who is stepping down in light off all the recent issues.
So, now I ask you, do you think every pilot, every ship captain, every single person down to the guy who cleans toilets in the Estonian Air Force need to be sworn to secrecy? Or do you think they are just people doing thier jobs?
One explanation sure seems a heck of a lot simpler to me.