While I cannot claim to have known MR Feynman I do remember reading a couple of books either written by him or by an author attempting to explain MR Feynman's theories and views.
No I do not buy into the he would have been a good Presidential candidate philosophy, or dictator possibly though. Mr Feynman had an extremely low tolerance level for fools and stupidity. Ignorance could be treated and in some cases even cured.
His disdain towards pseudo-scientist directly parallels my feelings towards them the same as my feelings towards those I called pseudo-engineers or those who were in high engineering positions without having worked in their respective fields as apprentices either prior to or after obtaining their degrees
Now when it comes to the subject of this food is terrible for you or you should be eating these foods every day or never eat this food without eating that food as well these so called nutritional gurus are little more than publicity seeking hacks in my opinion. The same goes for politicians, a subject which every time it comes up feels like a thorn being shoved in my side so I try to avoid it whenever possible. The news media has long since ceased to report news in favor of creating pointless talking points in hopes of fanning a spark into a raging fire which can only be extinguished by dousing with vast quantities of flammable liquids