It does seem that many people believe that the way people become ghosts is by having a violent death. It seems that this conclusion was drawn based on television shows, stories and movies that people created. So, these were the writers’ thoughts. Also, when people go to haunted houses, they hear stories about a ghost that haunts the house.
Usually, the stories includes the death of the person who became the ghosts. Also, the person had a horrible death. Many times, you hear that many of these haunted houses include stories about children who haunt the place because they were killed in such an inhumane way. Although, this seems to be the norm, there are cases where ghosts haunt a place and the story about the person’s death is unknown.