I'm deeply sorry for your loss even if your dad's quoted IQ is wildly unlikely.
I have been consistently confused, though, at how some very, very intelligent people can make similar intellectual mistakes. My IQ is a little north of average but nothing to write home about, yet I've had conversations with a large number of people who were more intelligent than me, yet still trapped in the White guilt mindset. One of the most boggling situations is when you come across someone with an IQ so high, that you probably don't know anyone smarter (say 145) and they've still fallen for that nonsense.
Part of it is their personality, of course, but I never see anyone but Whites fall for this trap, it seems to be uniquely targeted.
Anyway, if your father is younger than 70, tell him to go to a clinic and get gear (they call it trt) and hire a personal trainer to help form check his lifts. Hard lifting does wonders for everyone's brain. If he prays at the Iron Temple consistently, talk to him again in a year, he'll likely have changed his mind.
Hubris is common in this segment. You're so accustomed to being the smartest person in the room you become jaded at the possibility someone might know more than you.
Intellect also brings isolation. IQ is inversely proportional to number of friends. Interpersonal skills generally suffer. This opens the door for fewer personal challenges which otherwise force learning.
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