It's unsurprising that many of the people who have done the work to seek out repair cafes have also traveled far from the mainstream authoritarian narrative, and have half baked "crazy" theories filling the gaps. I don't know that much can be done to help convergence, besides tearing down that mainstream narrative so that it alienates less in the first place.
And yes, it is frustrating listen to ignorant rants. But if the flavor of ignorance substantially matters to you, then you need to examine your own assumptions.
For example, a bog standard plain white washing machine in 1962 would run you about $200. An equivalent no-frills washing machine today will be about $300. So yes, of course things back then lasted longer -- you were paying about ten times more for them. If there were a market for it, a manufacturer today could easily make a $2500 basic washing machine that would last 50 years with relatively little maintenance and make it inexpensive to repair if it does break.
Very well built, very repairable.
I've had the opposite experience from repair forums and such; most of those into repairing things tend to have agricultural/automotive/trades backgrounds, and seem to be more ring-wing libertarians. Lots of them are anti-EPA too, which is a bit surprising. Perhaps both extremes of the political spectrum oppose the throwaway culture...