the group with which i am familiar whose members have the very worst credibility index is the professoriate. it gets worse the higher you go, and you really do not want to listen to them harvard/princeton/stanford-type dudes. convenience-store clerks do a lot better, overall. they are more sincerely trying to find the truth. then there is the fact that the profs are constantly patting themselves on the back as particularly rational, which makes them (ok, ok, us) wrong in the sense of believing what's false, and also wrong in the ethical sense. fortunately i personally am very humble about making judgments like that, harhar.