That is absolutely rediculous... when a repressed emotion or memory surfaces as a manifestation in a psychedelic session, it is very easy to have a bad trip.
Go read:
LSD: Doorway to the Numinous: The Groundbreaking Psychedelic Research into Realms of the Human Unconscious by M.D. Stanislav Grof
He has conducted somewhere around 4,000 LSD psycholytic sessions... once you read about BPM & COEX systems, you will clearly see that you can have bad trips without resisting the substance.