Naive hippy nirvana
So? How well do you think undercover ops would work if the undercover officers had to tell the truth? Time for you to climb down out of your naive hippy nirvana and rejoin the real world.
Well, there is telling the truth, and telling the truth. "Two undercover police officers secretly fathered children with political campaigners they had been sent to spy on and later disappeared completely from the lives of their offspring" https://www.theguardian.com/uk/2012/jan/20/undercover-police-children-activists Perhaps those children and their mothers wouldn't have been so damaged if the Police had been a little more honest.