“Blue lies", white lie

white lie

noun

1. a harmless or trivial lie, especially one told to avoid hurting someone's feelings.

   
   

   "when I was young, I told little white lies"

Urban Dictionary: white lie

www.urbandictionary.com/define.php?term=white%20lie

"I only view you as a friend." is a common white lie. It usually means 'I don't like you and don't want anything to do with you'. "I love you too" can also be a white ...

 “Blue lies",

The present study examined the developmental origin of 'blue lies', a pervasive form of lying in the adult world that is told purportedly to benefit a collective.

Lying in the name of the collective good - NCBI - NIH

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2570108/

Scientific American

“Blue lies" is a psychologist’s term for falsehoods, told on behalf of a group, that can actually strengthen the bonds among the members of that group.

How the Science of "Blue Lies" May Explain Trump's Support

They’re a very particular form of deception that can build solidarity within groups

BLOGS.SCIENTIFICAMERICAN.COM