How do Leaders Lose Compassion?

I took a friend of mine to see the psychic surgeon Stephen Turoff this week for some healing. I have been to see Stephen Turoff a couple of times previously and read on a website that :

He (Stephen Turoff) cannot, however teach anyone to become a healer. In Stephen's words, "a healer needs to posses two qualities, Love and Compassion". He can therefore not instruct others in the mystic field of magnetism and electricity, only give a greater understanding of who you are and how best to apply yourself.

That belief led me to reflect on the concept of "compassion" as part of the research I am doing for my new book "How to Rock the Boat ... Safely!" What I have noticed in organisations is that when a "worker" gets promoted to being a "manager", often, their former peers will complain of a decreasing level of "compassion" with an increasing focus on "profit" by their colleague who has shifted loyalties from "workers" to "management".

Sometimes there is a gradual drain of "compassion" in favour of task-focused, efficiency-driven strategies which leads to redundancies, dismissals, tribunals and disciplinary processes. Years of friendship turn into sour memories.

How do people in leadership/management roles so easily lose the compassion which formed such an integral part of their relationships at work at some point?

Is compassion innate or is it something we learn? If compassion is innate what determines our choice over "people first" or "profit first"?