Sensitive people care when the world doesn’t because we understand waiting to be rescued and no one shows up. We have rescued ourselves, so many times that we have become self taught in the art of compassion for those forgotten.
When someone doesn't show up, the people who wait sometimes tell stories about what might have happened and come to half believe the desertion, the abduction, the accident. Worry is a way to pretend that you have knowledge or control over what you don't--and it surprises me, even in myself, how much we prefer ugly scenarios to the pure unknown. Perhaps fantasy is what you fill up maps with rather than saying that they too contain the unknown.