> What truths do people believe that are wrong, and what do you believe the truth to be?

I'm not certain.

> And why would they protect a generation and from what and why?

It's very common to delay information to minimize its impact. I suppose for "national security." My intuition is that it is a matter of country pride, and cultural "ownership" over a world wonder.

> And will they not protect the generation who are coming up now, still learning the false truth because the real truth hasn’t been revealed yet?

No, that's how delaying information works. They'll all be dead by the time it comes out anyway.