Who was Dale Carnegie?

RushMama2112, I watched show about Charles Manson .He used Carnegie's book about how to influence people and win them over to his way of thinking. It worked. He got people to kill for him. I am sure Carnegie never thought his ideas would be used for evil.

Player #9442102, politicians use it also.

Deadfly, that particular sentiment is found across all religions. Because it's good advice.