I understand that reaching billions of people seems scarier, but how does it really differ from being able to convince the entire Roman Senate with one skilled oration? Convincing either group could lead to horrendous acts being committed.
The main difference is that there are more people, they can interact more, and their opinions matter slightly more than in the past. Those things also allow us to understand the deeper motives and purposes far better than ever before, even if we still foolishly ignore them.