What are some examples for the cost of happiness in The Chrysalids?

There are many instances of characters characters "paying"
for happiness in this novel. 

The people of Struen give up
their children and, in many cases, their wives in the name of normalcy.  Any child born
with an abnormality is sent to the Fringes.  For many parents, like David's aunt, the
knowledge that you are likely sending your child off to die is agonizing.  If a woman in
that society gave birth to 3 children with an abnormality they were also shunned by
their husbands and sent off to the Fringes. 

Individuals
sacrificed love and friendship in an attempt to be "normal".  Anne gives up the group,
including her sister, and shuts down her telepathic powers in the name of love and the
desire for a "normal" life.  Anne also ends up betraying the group to her new husband in
the hopes of finding happiness with him.

Uncle Axel pays
for his love of his nephew with his own morality by killing Anne's husband to prevent
him from revealing the secret that they are all
telepaths. 

David pays for his love of his friend Sophie by
first hiding her deviance and then later staying away from home to prevent his father
and the others of the town finding the girl.  The cost is a painful whipping and the
scorn of his father.  It was all for nothing anyway because Sophie is caught and sent to
the Fringes anyway. 

The novel ends with the ultimate cost
of happiness.  Even though David and the others who have escaped are on their way to a
new land where their abilities are valued, it cost the lives of Sophie, Gordon, David's
father, the other invading Struen townsmen and all of the inhabitants of the Fringes
camp.  David may have won a lifetime of freedom and perhaps happiness with Rosalind and
Petra but he has lost his parents, his other sister, the other telepaths and his Uncle
Axel.

There is always a price to pay for happiness.  In
this novel it is a terrible cost.