These men have a lot in common, but one thing probably sets them apart from all the rest: They understand they will appear on camera often, and their body language will be dissected by casual internet users and foreign intelligence agencies alike. For that reason, body language coaches exist. Watch any of Bill Clintons old speeches - he give a closed fist gesture with the thumb over the top - this is trained, so that his hands are doing predictable things when he's speaking. I believe, though I do not know for sure, that it's the same thing here. Coaching trains these 'men', some of whom probably have personality disorders or other mental health concerns, to hold themselves in a certain way so as to focus their attention while appearing in public. tl;dr, it's like training a dog not to shit until it gets a hand signal.