Not crying from a broken bone isn't always that hard to do, depending on which bone it is. Seeing people or animals dead gets emotional, when you have some sort of attachment to them. Like so many are moved by seeing dogs die in a movie, because they had spent time watching the movie, getting to know the dog. Many people have family members that they just basically do not know, so they don't feel sad when the relative dies. edit: I could have been more specific, by getting to know a person or animal, I mean develop empathy for them.