They are not afraid because deep down they think death is still too far away. Thus, their dismissal of fear is only temporary and unreal. Surely they will be very scared when actually facing natural disasters or their own illness, not to mention real death. So why are they not afraid of death? They are not afraid because they don’t know what death really is. That’s the only explanation.
~ Depicted from "THE HANDBOOK FOR LIFE"S JOURNEY : On Death And Rebirth-Understanding Death