I don't have the research to back this up, it's just what I remember from having read several times over the years, perhaps someone else has sources.
My understanding is that humans are wired to be put off by physical un-wholeness and abnormalities. Folks who have been severely burned, are missing limbs, or who have deformities are marginalized because people look away. Strong difference has to be acclimated to by most, and is jarring when unexpected or not normalized. I would imagine that seeing a dead body when the vast majority of bodies are alive is also a jarring anomaly. From what I recall, we have expectations of wholeness and symmetry, and anomalies cause adverse reactions. For some that may be traumatizing, especially if they were unprepared, or if the anomalies were new developments in someone we cared about or had known for a long time as being whole and symmetrical, or alive.
@nigelhernandez, you would probably do well in a career as a mortician, death investigator, physician or surgeon since such anomalies don't affect you.
