It's a bit unfair

When we hear about people dying, people we didn't personally know, we think such a shame a person with dreams, with a future, or just a person died, without knowing them or anyome related to them we feel an unconditional sadness.
But when someone we love dies, someone we were connected to, we feel sorry that we lost their role that they had from our life. When our mothers die we think what am I going to do now without my mother?