"How Wrong Can One Man Be"

Yester-day, I listened to the 1974 Colin Blunstone concert that the Zombies Fan Club posted.  Later, I was thinking about "How Wrong Can One Man Be" (included in the set list) and had a small realization:  the song is in D major but ends with an A major chord, and this lack of musical resolution matches the open-ended nature of the question in the final line:  "How wrong can one man ever be?"