With regard to photo identification, collectors generally have a fair amount of money sunk into their photographs, so if they are told that these images are misidentified, it's going to hurt them in the pocketbook. Thus, many will not react favorably.
Also, in some situations there is simply a disagreement between two different parties. One insists it is, the other insists it isn't, and neither accepts the other's viewpoint. In these situations it is possible to never have a consensus.
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