The need to dominate others is strong in our internal psyche. Some of it is heriditary, I am sure. There indeed natural psychopaths, but with the right training, psychopaths can be reasonable participants in society. But we should not expect them to have strong empathetic attitudes.
But there's also dominance is an addiction to relieve other unresolved issues. When we can manipulate others, we get a buzz that makes us feel good. But the underlying issue is still festering.
Life in a political party is a polite game to acquire status, influence, and power within the party. For those who like manipulating others, politics is a good forum. That forum would be OK for these people to relieve their internal stresses. But the actual stakes are too high. We really need to push these kinds of people away from power. I think my TDG will do that much better than the current version of democracy--which seems to be attracting them.
In many ways, we humans are like all sorts of herd and flock animals. There is a pecking order. If we are on the low end of that pecking order, we are still looking for ways to be a little higher. We really need to train ourselves out these natural inclinations.