This theme is of course best exemplified by the attitude of the Waknukians, who do whatever they can to try and keep mankind in its current form and eradicate any deviations from that form. This is presented to us through the harsh regulations that mark this society concerning mutants. Note how this is first introduced at the end of the first chapter, after David has met Sophie and thought nothing of her extra toe. David recites The Definition of Man:
And any creature that shall seem to be human, but is not formed thus is not human. It is neither man nor woman. It is a blasphemy against the true Image of God, and hateful in the sight of God.
The Waknukians therefore expend all of their energies on trying to halt the evolution of man, classifying any advance on the "true form" as a mutation and a deviation that must be ruthlessly stamped out. Note the way that the Sealander woman comments upon the futility of such an endeavour:
They have become history without being aware of it. They are determined still that there is a final form to defend: soon they will attain the stability they strive for, in the only form it is granted--a place among the fossils...
Trying to stop change and halt its progress therefore is shown to be far more harmful than just letting change take place and ceasing to resist the inevitable. Resisting results in a number of the Waknuk males being slaughtered and much hardship.