I have no axe to grind with Nick. The opinion he expresses is one held by a great many people. It's also why I'm generally wary of paranormal investigators, and caution experiencers about the potential perils of seeking external validation.
"People who think the phenomenon is a positive one need a good wake-up call." ~Nick Redfern
Describing the phenomenon as positive or negative is not my cup o'tea. What I do know, beyond any shadow of a doubt, is that my experiences have been overwhelmingly positive. Someone else could have basically the same experiences as mine and describe them as negative.
I would humbly suggest "People who think the phenomenon is a negative one" could conceivably benefit by studying this staggeringly complex phenomenon from a different perspective.