My wife came across (and then experienced) a term from social work called compassion fatigue. When you give yourself to helping a lot of people without taking regular and adequate time to care for yourself, you get jaded and burnt out. Think social workers, pastors, etc.
It isn't inevitable, it just takes making some very clear and consistent boundaries. And honestly it only happens to people who are already making most of their lives or employment about helping others (so like 2.8% of the population?). So really I think the application for most of us would be that we need to really respect the boundaries of people who give of themselves so often. And maybe encourage (or force them) to care more for themselves so that they can keep on helping a lot of people.