What is John Wyndham saying about David's beliefs and values and how do they effect on his behavior in The Chrysalids?

Oddly enough, somehow David, even as a young boy, has
values and beliefs that are different from those of his father, the Magistrate of
Waknuk, and different from most people in his community. To make this difference
believable, John Wyndham gives David an Uncle who sees for himself the error of the
fanaticism of the belief system in Waknuk. Perhaps Uncle Axel saw enough of the world
beyond Waknuk or understood and believed the reports of that world enough to give him a
clearer vision and more reasoning attitude.

In any event,
David's values and beliefs are innocent ones of inclusion and tolerance instead of
blamable ones of exclusion, punishment, and division. The irony is that in the end the
Sealanders turn the final judgment against the Waknukians who are demolished in
death.

Wyndham's interest was in how long-established
beliefs and values--logical systems--are detrimental to the survival and integrity of
humanity when the world drastically changes, through one means or another. It was
Wyndham's belief that logical systems had to be reframed in such an event, the way the
Sealanders did--and the way David was doing. Of course, David was helped along by the
fact that he had a Deviation that made him a Blasphemy and subject to punishment, even
death.

David's values and beliefs led him to behave in a
way that was loving and kind instead of punishing and coldly distant. He was led to help
protect and guard instead of expose and harm. An illustration of this is the incident
with Allan and Sophie. Allan was of a comparable age with David and, whereas David was
gentle and kind with Sophie and quietly protecting her, Allan judged and condemned her
and loudly exposed her resulting in her punishment and
banishment.

Further, David's beliefs and values led him to
lead, counsel (following Uncle Axel's admonitions) and protect the other telepaths in
and near Waknuk, including his younger sister, Petra. Finally, he was led to summon the
courage needed to lead the other telepaths in their escape from Waknuk, with his
avenging father is hot pursuit.