Most people don't think it through. The apparitions and ghosts are not dead humans. They are fallen angels looking to deceive. So many people get caught up in the occult because they think this stuff is harmless never thinking we are in the middle of the battlefield.
There is major deception happening world wide as the time draws near. Jesus said it would be so...and there would be many anti-Christ's. What we so often see are false religions masqurading under the disguise of Christianity and use of it's vocabulary. In time "expereinces" with the unseen world are encouraged, sought and believed..... In doing this people leave themselves wide open for demonic influences, which usually manifest themselves as persons people are familiar with...and often as well Biblical names are used in which they identify themselves as....... It's a powerful "Hook" which then leads to desiring more of these expereinces....and once these become common place ones faith eventually rests in the expereinces themselves as they tend to become an individuals source of truth...when in fact it is a lie and a very destructive lie.