I've heard that there are dogs that will eat until they die from their stomach exploding if they are supplied with a limitless amount of food. People are not so different.

It's not so much that these billionaires are necessarily especially evil as individuals, but their power and limitless greed leads them to evil outcomes. Like, Eichmann's portrayal in the article, he was just doing his job without regard for the moral consequences.

Though when you hear about Facebook's role in the Rohingya genocide in Myanmar, it does seem as though Mark Zuckerberg is a psychopath. He seems to have little regard for the lives of people affected by his product.