I agree with you for the most part and my question was somewhat rhetorical. However, I've personal experience with traumatic death/violence on more than one occasion (in fact, as recently as 3 weeks ago following a shooting at the yoga studio where practice) as well as focused study of violence and trauma at a doctoral level. People do react differently, but it is unusual - even amid the shock and chaos - for people to not reach out to family/close friends in the hours if not minutes after tragedy. More to the point, if I'm not mistaken, first responders are trained to (try to) keep victims calm and aid them in thinking who to contact (family/close friends). Perhaps there are some on the forum who could comment?
All that said - I don't know that PC and his immediately family didn't reach out to family - the post I was responding to assumes they didn't (and thus, my somewhat casual response).