Most likely, they are lying to themselves to protect themselves from their own pain.
It's easier for the "son" to say that it's good than for him to acknowledge that he has been trained to believe a lie his whole life. And of course, his "father" wants him to believe that lie as well.
When you have the strength to acknowledge the pain that it has caused, then the whole illusion falls away.
Cant
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"There is a Catskill eagle in some souls that can alike dive down into the blackest gorges, and soar out of them again and become invisible in the sunny spaces... even in his lowest swoop the mountain eagle is still higher than other birds upon the plain, even though they soar." -- from Moby-Dick