I can only really echo most of the thoughts on here. I have been saddened by the recent news regarding the shootings in America but not distressed by it, I do feel a sense of anger about any incident where a lot of innocent people are killed and I can not comprehend why. Anything involving cruelty or harm to children I find disturbing, (partly why I do what I do) but it doesn't upset me or make me cry, (again, I'd be useless at the day job if I cried at every horrific story regarding kids I heard). If I can help in a practical way then I will. If I am interested then I will follow the news. I think the sense of anger is as close as I come to an emotional response to news items.
There are certain celebrities I might feel that we had lost something if/when they die, (such as David Attenborough) because I admire them and what they do, but I am extremely unlikely to cry or become emotional about it. Natural events that kill a lot of people don't upset me either but again, if I can offer some practical assistance, (like money for charity) then I will.
I actually find something a bit sick about people trying to out-do each other in the outrage and pitchforks when there is a news item about a child missing or some such thing. I find it unsettling. I very much dislike mob mentalities.
I don't consider myself hard hearted or a b!tch, in fact I think I'm actually probably quite a kind person. I just find it hard to have an emotional response that does not effect me and mine. I also would very much hate to be caught crying or very emotional in a public place, and generally if I cry then it is because I am angry rather than sad.