Why does Pelligrini’s quotation give credibility to Freedman’s idea that the doctors at Ellis Island were greatly feared?

Pelligrini’s own family experienced physical examinations. He can recall their feelings.
Pelligrini is a good storyteller. He makes it enjoyable to read about his experiences.
The quotation is from a writer who has written extensively.
The quotation is from an immigrant who knows what all immigrants felt.