Eyewitness to the Gods

In all his years of service, why didn''t Erich von Däniken ever doubt his theory that inhabitants of other planets had come into contact with humanity ages ago and that they still observe us today? How could von Däniken, in all these years, say firmly that the UFO phenomenon is real and that people are being abducted by aliens? Why does he repeatedly criticise the official historiography and our r...