I think we've learned from the Trump era that you don't need to try to keep things secret. Even if you explicitly try to bring to light things like poor handling of Covid by the Trump administration large portions of people will not believe that.

So I think something similar may happen inside governments, most government employees believe and accept the official truth, and don't try to spread a counter-narrative, or be critical about the official truth. Truth is what benefits the person telling the truth and it usually does not benefit you to be critical of the official version.

If we all believe it is the truth then who's gonna say it is not, except crackpots and people we label as such. Who wants to be labeled crackpot?