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Yes, just like Stockholm Syndrome, it was made up to cover up a bungled police response. Neither one is a real thing.

Source? https://en.wikipedia.org/wiki/Stockholm_syndrome#FBI_Law_Enf... says it's rare but FBI seems to be saying it is a real thing.

FBI isn't exactly a trustworthy source of psychology. Psychologists and the DSM do not recognise it as a real thing.