Science fiction is essentially a kind of fiction in which people learn more about how to live in the real world, visiting imaginary worlds unlike our own, in order to investigate by way of pleasurable thought-experiments how things might be done differently.
Early fear was felt cellularly and was indeed real. Defensive postures were necessary, but defenses generalize cellularly in adulthood and do not expire. It takes conscious work to undo them. Ironically, as long as we keep using defenses, we actually maintain the original force of the fear.