The author of the book Far Journeys is spinning fiction, as can be quickly demonstrated. His proposition is that aliens who cannot themselves generate emotion can siphon this off from an emotional species. This is physiological nonsense. If a species is not experiencing emotion themselves, lacking the pathways in the brain and the hormonal stimulants, they cannot experience this vicariously. There are those who wish to alienate humans from any contact with visitors from other worlds in order to retain control over humans society, but this author is doing so purely for the profit motive. Fear sells books, as people are quicker to stay abreast of bad news than good, a fact to which any newspaper operator will attest.