"Deception
A simple justification narrative is often needed when an organization has determined a policy that is beneficial to themselves, but has no benefit, or even extremely negative consequences, for the majority of people. A politician obviously can't just admit that the socially destructive legislation he is trying to introduce is extremely beneficial to particular corporate interests that have promised him all kinds of kick-backs when he leaves office; so he needs a justification narrative in order to make the idea palatable. When the objective is either the primary reason in itself, or when the primary reason cannot be admitted, it is necessary to create a justification narrative.
Confirmation bias
Justification narratives often rely strongly upon confirmation bias, which is the tendency for people to be significantly less likely to critically analyze a statement that fits comfortably into their worldview or provides support to the policies of a favored organization.
Simplistic justification narratives are aimed at uncritical thinkers; people like reactionaries and political tribalists. Once these people have a satisfactory narrative that is easy to understand and is easy to remember, they are unlikely to ever begin questioning the basic premises and assumptions of the narrative. Once the mind is sold on an idea, many people won't ever bother to examine it more closely for fallacious reasoning, generalizations, misrepresentations or omission of evidence. If the story seems to make sense, many people will simply accept it at face value. "
source: http://anotherangryvoice.blogspot.com/2012/10/justification-narrative-definition.html