To me the analogy of the monstrous fish is also very reminiscent of Nietzsche's story in "the gay science" of the madman exclaiming in horror at the public square:
> "God is dead. God remains dead. And we have killed him. How shall we comfort ourselves, the murderers of all murderers? What was holiest and mightiest of all that the world has yet owned has bled to death under our knives: who will wipe this blood off us?"
Realising this horrid truth opens an opportunity to defy the structure of society and follow one's own convictions.
But as augment_me says above, not everyone can bear the cost of ignoring incentives. I think all of us have stories where we had a good conception of what the right thing was, and wanted to do the right thing, but money trouble or job security meant we had to follow bad incentives- I certainly do.