His point was that it takes very little to get people to openly proclaim beliefs they don't hold.
And that needed to be proven, because.... ? Or is this just one of those bullshit "social experiments" where Youtubers get to act like assholes because they're holding a camera to record what happens?
Youtube is a cesspit of wannbes trying to outdo each other in shock value, while avoiding getting banned by Youtube, all for the views. PewDiePie was just another one playing the game, but he got burned. He paid people desperate for money to do something stupid, and then pretends to be shocked that they actually did it. That way he gets to claim he's not really responsible, while being the one who conceived it, paid for it, videoed it, uploaded it and collected the ad revenue.