alt Hacker NewsNot according to the people that coined the phrase "radical ignorance".
"While there are different types of knowledge and many ways to make it visible, there are also several types of ignorance and different ways in which it might escape the subject's consciousness. For example, while many instances of ignorance fall into the category of unknown unknowns, where an agent is not only ignorant about something but also about her/his state of ignorance, other instances of ignorance fall into the category of ignorance in disguise, where an agent is not only ignorant about her/his ignorance, but also mistakes his/her misbeliefs for valid knowledge, i.e. the ignorance is disguised by misbeliefs accounted as knowledge. Radical ignorance is exactly a phenomenon of this last type. It is very difficult to explore radical ignorance; nevertheless, the so-called Dunning-Kruger effect (Kruger and Dunning 1999) is an example of how such a phenomenon might manifest itself in everyday life."
One of us experiencing irony...
https://www.researchgate.net/publication/342250736_A_working...
It appears that the phrase has multiple uses/meanings, with priority of definition going to Dunning & Kruger as far as I can find.
This is the earliest clear definition in the sense I was recalling that I can dig up:
"In its place would be substituted the concept of partial radical ignorance. The adjective “radical” is here meant to distinguish this kind of ignorance from the neoclassical concept of rational ignorance, which refers to a state of affairs in which knowledge exists that would improve our situation but that the expected cost of acquiring it exceeds the expected benefit. We thus choose not to know what is not in our interests to know. In contrast, radical ignorance refers to our unawareness of even the existence of relevant knowledge that we could know at zero cost."
https://departments.gmu.edu/rae/archives/VOL16_1_2003/4_Iked... (digital reader page 5)
I'll concede that this usage is highly niche and lesser known, but I'll have you know that I'm wholly incapable of appreciating irony and will never fully acknowledge my error.