Carl Wickland, Charlotte Dresser, Franklin Loehr and others have written about the physically living being in the best situation to assist/rescue lost spirits who don’t know they have transitioned.
A spirit explained to Loehr that
“the best way to reach most of these (spirits) – about the only way – it seems – is by a person still in the body. These lost ones don’t recognise the reality of their death, so they are closed to us. But they recognise the realness of persons still living in the human body. So these lost people can be reached by living people on earth. Psychic rescue work, it’s called.”
Loehr, Diary after Death 51.