Then how would you explain someone's grandmother who sees her own mother standing by Jesus hours before she dies. Know that this grandmother is completely coherant and not of feeble mind. How would you explain the look of wonder and awe on her face as she names additional family members who she sees by her Lord and takes great joy in knowing that they will be reunited and have eternal fellowship with their Lord? I am sorry but I do not believe that these are demonic forces. I am not ignorant of the activities of hell's future occupants. I believe that God can allow anything that He sees fit to allow. Were Moses and Elijah on the mount demonic impersonators? No. As for the "ghost stories" I don't believe that the spirits of the deceased roam the earth and haunt people. But I don't discount all "spiritual" appearances. Especially without discernment of the time and context (etc) of the "visit".
About 4 years ago, my Grandmother was very ill. She thought she had bone cancer (actually a fracture) and she was giving up. Anyway, she said that one night, she saw my Grandfather up in the corner of the hospital room. She said "D.R. what are you doing there" and he said "I've come to take you home." She said "Home?" He said, "Are you ready yet, I've come to take you home." Shar said the she was not ready yet. And said, "when you're ready I'll be back." My Grandfather had been dead 3 years.
I agree. In your example, it would lead the people involved to have faith, more faith, and total belief in God and Jesus which would negate Satan's intentions. It would be a losing gambit for Satan.