"Don't tell me you care?"

I was notified that one of my students was suspended for 10 days pending a tribunal. Since this will be his 2nd tribunal there is a great possiblity that the school will not let him return this year. I have worked with this young man all year trying to keep him on track. He is so smart and very respectful to me. He never gives me the first minutes trouble, does all his work, is the first to volunteer for everything we do and has a B average. Pretty good for a kid that normally stays in trouble with all of his other teachers.
As I was signing in the other morning I overheard one of our Resource Officers talking to a teacher about this young man. I then heard him say that the boy probably wouldn't be
back because he was still in jail. Well, of course my mouth dropped and you probably already know that I had to ask. I just couldn't imagine him being in that much trouble. So I told the office that I taught the young man and asked what was going on. I suppose I had that "concerned mother" look because the officer gave me the oddest look and said, "don't tell me you care about this kid. You look like you could cry." Well, I wasn't going to cry and I told the officer that I was just surprised that the young man was involved in the situation. I told him that he was a wonderful student. His response was, "we must be talking about two different kids"
So why is so surprising that I would care about a student? Are we only to care about the fine, upstanding, All American student? Are we only to care about the ones that are in the IB programs or the outstanding wholesome athlete? After all isn't that a part of being a teacher?
Why wouldn't I be concerned or upset? Why shouldn't I care?