One of the most striking features of the early Trump administration has been its political uses of lying. The big weekend story was the obviously false claim of Donald Trump’s press secretary, Sean Spicer, that Trump pulled in the largest inauguration crowds in American history. This raises the question of why a leader might find it advantageous to promote such lies from his subordinates.
First and most obviously, the leader wishes to mislead the public, and wants to have subordinates doing so, in part because many citizens won’t pursue fact-checking. But that’s the obvious explanation, and the truth runs much deeper.
https://www.bloomberg.com/view/articles/2017-01-23/why-trump-s-staff-is-lying