This is not a 'new' concept it's as old as time and 100% of people with real power have an awareness of this, it's almost a defining feature of an elite class.
Policy should obviously be guided by 'Truth' and we need transparency, at the same time, irrespective of how smart individuals are, as crowds, we act with a lowest-common-demoninator IQ and things need to be communicated effectively.
A great example of 'Truths We Cant't Handle' are vaccination-caused deaths.
All the vaccines cause death, and AZ is particularly tricky. But it's really hard to find exact data on that because it's very well suppressed. I suggest it's probably available with some digging but if you imagine a 'chain of communications' from the doctors, to health officials, to politicians to media, all of whom are ostensibly trying to act in the interest of the 'Public Good' - it's not going to come out.
Bonnie Henry in BC is a great Public Health official, I listen to her communications almost weekly, very smart, generally open, data-driven, smart journalists asking good questions - but they have never broached the subject of 'How many have died form vaccines'. The information is just too explosive. So they don't talk about it. We're learn more about it after the pandemic.