It is not only psychopaths, it is all inhumane people, i.e., people with no conscience and no empathy (no love, only hate).
The key issue here is, you may be surprised to know, is health! The way these people operate is to affect another person's health. If they can underhandedly play foul games as to affect the health of another person, then they can gain power and influence over the other person so as to be able to manipulate and control them.
So the solution is to understand that disease is not due to any physical causes as we are being told over and over again. Disease i