Cults depend on fear to control people. This is one of many fear tactics used by the JWs and Christianity in general.
I disassociated myself about 20 years ago. I began to examine the jw religion more deeply and researched other, older paths. My husband at the time who was raised a j.w. (we will call him "Bad Company") got really scared. He would not allow me to have any books on ancient pagan theories in the house. I actually had to keep them in the garage. He was absolutely convinced just having the literature in the house would surely bring demons upon his family and we would all probably die. As I continued to study other belief systems and the positive things about them he realized there was nothing to fear (except cults).
In my opinion there are nice, protective, loving people in the world and obviously there are mean, evil, sickos and every degree in between. They exist in our every day lives and they exist on the other side as well. Why would a soul change just because they have passed over? I do not believe in "demons". I have experienced both positive and negative energies over the years. I will give you examples of both:
I live in the family farm house that was built by my great grandfather in the 1920's. At least two people have died in this house (peacefully). My great uncle and Grandmother are regulars here. I've seen them, my children have seen them and friends have seen them. I see things move, see white balls of light dancing on the walls, hear things fall, things go missing and reappear (Grandma had a good sense of humor), etc. It's not scary, it's comforting. It's a loving and fun energy. Are they really here or is it simply energy left over like a fingerprint? Can't say but it doesn't matter because it's a positive presence.
On the flip side.... I've dealt with someone from the other side that picked on one of my kids when she was young, threw a smoke detector and a belt at my son and someone grabbed my foot (which is a huge freak out for me). I saw evidence that a friend dealt with someone very dark as well. Again, I do not believe this was a case of "demons" but probably more of left over energy of someone not so nice.
For me personally, I do not believe the bible was inspired by a god. I believe it is a compilation of mythology and generations of stories (read "The Jesus Mysteries") created by man. Demons are christian entities. I do not believe in the christian god, I do not believe in the christian devil, I do not believe in a physical hell nor do I believe there is a christian heaven that only "good" people get to go to. Therefore it is impossible for demons to exist.
You have been scared out of your mind by being taught as a child that demons are "gonna get'cha". As an adult you can rationalize they do not exist but the fact remains you are afraid. It's been instilled in you and has become a part of you and that in itself makes them real. I almost drowned when I was young because my mother drank and though it was hilarious to hold my head under water. So, guess what.... I'm afraid of water. It's the same issue for you. In contrast, I have raised my 3 children that this is not paranormal but normal. They are not afraid, they will speak aloud to energies they encounter and now they have great confidence in the entire world around them.
I agree 100% with Bad Company's post: " Just like the real world there are good ones and bad ones. Bad ones can be dealt with (knowledge and courage required). Good ones are your friends whether you accept it or not. Open up, you might find some friends. "
The veil between the worlds is a thin one. There is much more light than dark so do not live in fear. Do your research, open up and enjoy the positive energy that surrounds us everyday.