The author has made some very valid points.
I think a lot of this attitude that the ghost is an enemy come from television shows like Most Haunted and Ghost Hunters etc. One of the main reason I stopped watching Most Haunted was that I felt they lacked the respect that was due to the spirits in the building they were investigating.
Many time the presenter and crew would be swearing and egging on whatever spirit that was present in the property. They have been seen asking for the spirit to hit them, telling the spirit to “come on attack me I’m not afraid of you” and many more. No professional investigator would act in this manner.
I understand that when something physical happens to you on an investigation the natural thing is for you defence system to kick in and self-preservation takes over, however if you are a professional you would not let this take control and you would always show respect. I have been on investigation where things have been thrown or hair has been pulled or even people have been pushed but at all time I have demanded none of the people present ever try to threated or goad a spirit.