I'll agree with your last, but your first statement is as incorrect as well. How do you know they care about it?
If somebody is passionate, then they certainly do care about it, but you are correct lack of passion does not equal lack of care, so I'll revise my statment.
Public service is the last place I want somebody who is not passionate about their job.
Your statement inadvertently highlights the point on language which is being made in the article and in this thread.
Lack of Passion != disinterest.