My sister made certain choices about the life she wanted. Those choices include a steady job, a husband and children. But balance and stability come at a cost. It is harder for her to be spontaneous. It is harder to just up and leave.
We invest in things like the future, like our children, like education. In other words, we invest in things that we understand we will not see an immediate return of investment but everybody knows it will have a positive impact and you can easily measure it over the course of time. Your why is exactly the same thing.
Like a good parent can't also be his child's best friend, a leader with authority requires some separation from subordinates.