The first thing they teach you in body language class is to show their hands like that to signify:
- I am open to all different comments
- I am unarmed, trust me
- I keep an open mind, and welcome all suggestions
- I am an open book - trust me
The extraordinary efforts they make are easily assessed to be fake, as any body language expert will tell you.
There are subtle differences - the stiffness of the hands and the neck when they make these gestures - their own minds tell them that they are lying.
(through their teeth).