This question is in terms of not an unwillingness to do it, but you either can't get such a role or more to the point, you essentially lack the right type of personality, personal qualities, people, soft skills and other emotional subtleties and social nuances to take and deal with employees in the right way.
Similarly, certain skills you are either born with and hence have or not, and although one can be taught certain learned behaviours, you also can’t spend a lifetime trying to learn skills which just don’t come, flow naturally, struggle or have difficulties to come out or which you don’t automatically pick up on.
At a certain stage of your career you know that you have what it takes or not.
Can a career in HR academia and research offer a way out?