If you filter information so that nothing threatens your view of the world, you may call it 'confirmation bias'. We all do it, actually.

https://en.wikipedia.org/wiki/Confirmation_bias

However, I think more useful would be to explore the following defense mechanisms: rationalisation, wishful thinking, denial. Eg. see here:

https://www.psychologistworld.com/freud/defence-mechanisms-list

EDIT: There's also the concept of 'sunk costs' you might want to work with.

See here: https://en.wikipedia.org/wiki/Sunk_cost

If you filter information so that nothing threatens your view of the world, you may call it 'confirmation bias'. We all do it, actually.

https://en.wikipedia.org/wiki/Confirmation_bias

However, I think more useful would be to explore the following defense mechanisms: rationalisation, wishful thinking, denial. Eg. see here:

https://www.psychologistworld.com/freud/defence-mechanisms-list

EDIT: There's also the concept of 'sunk costs' you might want to work with.

See here: https://en.wikipedia.org/wiki/Sunk_cost