I don't think the skeptics among us are 'dumping' on people who hold spiritualist beliefs. We're saying we don't hold those beliefs and think some people are duped into holding them, by themselves or by others. It is just as valid for me to say I think psychic phenomena are not real or are misunderstood/misinterpreted physical phenomena, as for you to say psychic phenomena are real and stem from some interplay of this world with another 'plane of existence'.