The author expresses disenchantment with the elder generation in this paragraph, especially with those in positions of authority who were meant to teach and shepherd the younger generation into a world of maturity and responsibility.
The author's early faith in the knowledge and discernment of the elder generation was destroyed by the experience of war and seeing death and misery. In the face of the brutal realities of war, the author claims that the younger generation ultimately proven to be more trustworthy and insightful, despite being made fun of for their seeming lack of understanding.
A sense of loneliness and the realization that the world as the elder generation taught it has collapsed in the face of the harsh realities of war follow from this disappointment.