Vinge on PKE ?

Apologies if I repeat a question which has already been answered. My only gateway onto the Net is very expensive, and I miss many important postings. Some time ago it was asked why Vernor Vinge made passing reference to humans' naivete in trusting public key encryption, and some posters were seeking to contact professor Vinge for clarification. Has any further explanation been discovered for his distrust of PKE?