I think the skills are separable from the direction. Hitler, Stalin, Mao, Pot, etc. Were (at least for a time) excellent leaders. But, they led to death and destruction. Direction matters.
Discussion
I agree! Therefore I would say, it is not enough to understand if someone is a good leader or not to be able to select a leader.
This could somehow point to the direction that many people can't see the forest from the tree, which could lead to bad leader selection.