Here's an example of the difference between a "healthy" psychopath, a "healthy" normal person, and a person with a broken personality:
Driving down the street, you see a puppy in the road, trying to huddle it's way outta danger.
How would you respond?
Well, a psychopath may or may not stop; it depends on other factors - not primarily saving a life -- are they late, is the puppy something that they want, would it create a personally dangerous situation, and what benefit would they gain in stopping. After the situation has passed, it is nothing but a memory that's mostly not remembered, unless they stopped. In the case that they stopped, there were factors that outweighed their personal safety and timeline.
A healthy, normal person would either stop, or feel bad that they didn't stop. They would normally dwell on not stopping, and talk about how they did it if they stopped.
A broken would most likely swerve to injure or maim the puppy, the propensity towards violence is ingrained in them, by whatever factors "broke" them.
And, to be fair, a person that's been desensitized to violence, or seeing others suffer, would most likely react like a psychopath, but they would know that making the choice like that is "wrong."
In world politics, when you have a narcissist in power, it creates jingoistic showboating and dictatorships. When you add in a broken personality you get Hitler, or the Kims in NK. When you put a pure psychopath in control, you generally get a "benevolent dictatorship." When you allow psychopaths to control, with others including "normal" people, you have a solid base of power, willing to send astronauts into space, or go to war to defend their borders, but not to knock down the price of gas or spread their political belief system. It's when power shifts to one group (emotional) or the other (emotionless) that creates the greatest problems.
We are indeed affected in our day-to-day choices by psychopaths in power, as well as by narcissists in power, and normal people in power (rarely does a person with a broken personality gain real power in the US, except in times of national emotional upheaval, when a crazy response most reflects the people's will.) How we eat is more or less dictated by our preferences and education levels. Convenience food is less frequently consumed by more educated professionals, whereas it's a staple in poorer, less educated communities. Why? Because we educated people know that eating McDonald's 7 nights a week is less economically viable than buying and preparing fresh/fresh-frozen foods. We also know that the long term health (and therefore financial) benefits do not support a diet rich in convenience foods.