He’s a bonafide sociopath. By his very nature, he studies others emotions and mimics them. He’s a stone and I am sure his handlers told him he needed to go up there and show emotion.
Exactly right. I have had long term dealings with a couple of sociopaths in my life and for some reason was able to detect their behavior right away (though I only learned the clinical terms for their behavior later). I've always been very good at reading eyes, faces and micro-expressions, so maybe that has something to do with it.
But, yes he is a clear-cut sociopath and as you can see here, fools people quite easily.