I feel sorry for the guy. He's tried to protect his daughter against threats from her estranged husband, and now she's missing. It's got to be excruciating for him.
That video only says to me that he's unfamiliar with being on TV and doesn't know what to do. He also looks exhausted. I don't envy at all what his family is going through, nor the weight that's got to be on that father's shoulders right now.
As for the chairs being placed where they are, they were more than likely positioned there by NG's camera crew.