In my youth, when I knew nothing and wanted to know everything, I wondered why anyone would ever want to not know something. I could understand sometimes wanting a delay in knowing things - for example surprise parties, spoilers to stories (movies, tv shows, books, etc.). But not why someone would want to never know something at all; that concept was inconceivable.
In mid-adulthood, I begin to understand. Every time a new piece of knowledge comes in, it requires processing time. Sometimes it means altering what's already known to make the new piece fit. Sometimes it means throwing out what was there before, when older pieces turn out to be obsolete or completely wrong. Sometimes whole worldviews drastically shift - and when the dust settles, entire paradigms have crumbled and new ones formed.
Assimilating new knowledge requires time, energy, and effort. Sometimes it requires chaos and pain. The more pieces of knowledge already there before, the more of them might need to be altered, discarded, or shifted. Learning new things has a cost, and the longer someone has been alive, living, and learning - the more already known - the greater that cost can be.
I can understand sometimes wanting a delay in knowing things - until the full cost can be borne. And I also understand now that sometimes the potential gain of knowing is not worth the cost at all.