Sincere is something that we all can sense and if you not, then it is nonsense. The point is not about right ore wrong, exist that secret world ore not ... the point is, why teller telling to us a story? Any sound one makes it is about that one regardless context. If you don't know why people talk, then it is not worth to listen them. Because deception lives in imaginary world that exist only in peoples heads. So The Truth is not in peoples heads, but all around us that we all can observe. We all do anything in order to fulfill our needs = live. We differ by strategies how to do that and smart people play on other peoples ability to imagine and harvest their attention, effort to live and fruits of their activities.