I guess he's some kind of documentary maker and british journalist?

He's a big bad dog from the BBC
And he won't break eye contact with a Nazi.

(Invidious alternative for YouTube-avoiders)

Without looking I'm going to imagine he'll say Jimmy Savile.
(Edit: Just checked and bingo... Savile was an utter scumbag pedophile who was said to have abused over 450 children. Evil living in plain sight.)

Oh you should check out some of his documentaries. They're all incredible. He's very disarming and charming and interviews some really awful people giving real insight into these hidden worlds.

TIL he's half-American.

I'm betting half the Epstein list has higher numbers...

The reality, is that it's a Youtube algorithm thing. People are more likely to click on the video if there is a human face showing an expression. Surprise, shock, and anger, are all top picks to show on thumbnails. And, IIRC, the Youtube algorithm AI looks for a human in the thumbnail, and that will push your video up in the suggestibility algorithm.

And one other thing. It's been shown to work really well with audiences that are kids, preteens, and teens. And being that that is the vast majority of users on YT... I think you can see the point of it.