Each person will have their own opinion. Pending on how open they are to new suggestions of things that are "unknown" is relative to whether or not they are capable of collective learning; coming to understand that not everything is black and white.
I worked for many years in the medical field - hospice was my primary source of care.
I will share with you one story of a patient I had.
This woman whose body was riddled with cancer was totally bedridden. She had lost her eyesight and means of most of her other bodily functions as well. My job was to keep her comfortable and when it was time, to have her presentable for her family. The last couple of days before her passing, she kept "talking" (it was actually more of a whisper) of the angels that were around her and how beautiful they were. To look at this shell of a woman was heartbreaking. Her eyes had "whitened" and liquids were only through an IV at that time. She being a private care patient, meant I spent my total time with her versus several patients.
A few hours before she passed, which happened to be on my shift, she started to greet her "mama", and other family members who were not visibly seen by others. She said that there was an angel with them waiting for her. Her husband who was sitting with her, and choking up (understandably), asked what the angel looked like. During this, I was in the process of opening the window some, as she described the angel wearing white. Her husband told her, "Honey, that is your caretaker wearing her nurses uniform." She replied, "This angel has long flowing white hair, my nurse has brown curly hair and is chunky!"
I spun around to look at her as she was saying this and her husband quietly stood up and eased out of the room to go get the doctor. As he was leaving the room, his wife said, "I can see you just fine! All of you!"
She then asked for someone to read her the Bible verse from Romans 8:1 - Therefore, there is now no condemnation for those who are in Christ.
As soon as the scripture was read to her, she drew her last breathe. The doctor came in to examine and call the time of death. As he examined her, her eyes looked like they were healthy, no whiteness covering them over as they had been for a while. Her husband told him what his wife had said and he said, "Why didn't you believe her if she described things to you of what she saw?"
This particular woman was my first experience with someone dying in my presence....and though she passed over 20 years ago now, I can still see and remember it as if it were yesterday. What transpired that day profoundly caught my attention.
Hallucinations? I doubt it. I talked with the doctor and other co-workers following her death about what had happened. The doctor explained to me that when he had first become a doctor, it was all about the science. Religion, spiritual beliefs, and unexplained occurrences were not acceptable to him. However, after being a doctor for 27 years (at that time), he had seen and witnessed enough things to stop seeing things only one way and he opened his mind to the presence of forces much greater than any of us were present and at work.
People are afraid for the most part to face their own mortality much less be in a position to face the death of another. Mostly, it is a fear of the unknown. What happens after death? Will they be in pain? Will they be alone? Does it all end as soon as their final breathe is drawn? All very normal and common questions which lead to what often lies for years as a subconscious anxiety and fear.
The day my father died, he was at the Bay Pines Veterans Home just outside St. Petersburg, Florida. I was 10 years old when he died and was living in New Jersey. My father had never been to this house, as my mother purchased it after he became ill. However, on the day he died, he appeared in full dress uniform to me in New Jersey with a very bright light that seemed to surround him. At the time he was there, it was the only VA facility that would allow children in to visit on the East Coast and I saw him only twice a year for 7 years till his death.
Something to always remember is just because we might not see it does not mean it is not there. The key is to gain from these experiences and continue to open our minds and learn from them. It is very normal for people who are dying or at deaths door to receive "visitors". It is literally just a preparation for the person who is dying to become ready for the next part of their journey.