There is a principle in psychology called "the identifiable victim concept" and this means that people tend to be affected more by individual accidents than disasters in which millions die, meaning the news of the death of your friend "David" usually has more impact on you than the news of the killing of 5 million people in ethnic massacres in Rwanda..
And in a saying attributed to Stalin, the Russian leader, it says, “The death of one person may have a tragic impact on people more than the killing of a million, and that is just only a statistical number.”
Psychologists prove this with a famous story in America about a girl named “Jessica” who fell into a well whose suffering affected people and their feelings more than the death of more than a million people as a result of a natural disaster that occurred at the time.
This is the nature of things!