Why hasn’t science found any concrete proof of ghosts and hauntings?
In the majority of cases, paranormal phenomena are subjective and not observable to others. Even when the phenomena are objective they are most often than not unable to withstand the scientific method, being able to repeat the process for testing. Even then, the human mind has the uncanny ability to dissociate from any unusual events that doesn’t fit into what we perceive the world should be. It quickly tries to rationalize anomalies and doubt their occurances.