I don’t know this for sure, but I believe there isn’t a light source inside our brain. The mind therefore lives in the dark. Disillusionment, I think has its roots somewhere there.
The mind lives in a dark place and translates the darkness as seeing things as futile. The more we look inside ourselves for answers; the more darkness we experience. Most answers are out there. Where we do see something positive, it’s an effort to absorb the light through our eyes and illuminate the deep recesses of our minds.
When perfection and imperfection come face to face, it seems that the frustration emanates from the perfect side. If perfection is so susceptible to being disillusioned, it’s not perfect, is it?