“There is no one on earth — not Tim Cook, not Bill Gates, not Donald Trump, not even the Pope — who can so directly and powerfully affect a third of the world’s population (2.23 billion monthly active users as of June 30, 2018) with the click of a button.”
Perhaps Facebook is a major example of why nobody should have that power. “He could be worse” is not a defense.
As for whether or not he’s malicious, it is important not to forget that he and his wife have sued native Hawaiians for rights to their ancestral land so that they (the Zuckerbergs) can surround their house with empty land. That is absolutely malicious.