Whether in a dark alley or a high-rise tower, the psychopath seeks to dominate others in order to satisfy their own desires. To deploy fear, shame or deceit to acquire your submission, the psychopath needs to know how you feel and how you will react.
Partly for convenience, and partly because the chicks dig it.
While the BBC essay and others, including the original report in Science, do not make for especially pleasant reading, I urge everyone to read something about this new groundbreaking study, for its results are important for every single human on Earth.