"Well, actually I like books that tell you how to be a better person."
In this sense, The doctor's assistant is ridding herself of negative energy when not necessarily exposed to this. By telling her mind that she sees enough doom in the world she will make herself not want to be like that or feed in to that kind of energy. In my opinion, this actually does work. Not having social media has helped me tremendously over the past 2-3 years its ridiculous !