Psychopathy has its relative benefits and detriments. They make great surgeons and CEOs as they can make decisions that require a lot of calculated decision making and skill but not a lot of empathy. In these situations the price mechanism is the greatest form of power as it heavily rewards these individuals for doing something that not many people can do well.
The real dangers come from psychopaths using and manipulating the centralized State for their own gain at the detriment of others. The nature of politics gives psychopaths a large comparative advantage over the rest of the population, leading to a lot of problems in terms of governance.
Less State = more benevolent psychopaths