Parapsychology is not the only example of pseudoscience; can say that Freud’s work is all hypothetical as you cannot falsify it.
There are many examples of scientific research where believers still persist with what they think even though there is evidence against it e.g. cold fusion – even though there is evidence against it and said the original idea was due to poor methodology people do still believe the theory today.
The AAAS allowed the parapsychological Association to become an allocated in member in 1969, thus appearing to confirm the scientific status that parapsychology has.
Research leads to valuable discoveries such as acupuncture which is now accepted as a valuable pain relief as research has demonstrated it has repeatable results.