> I've seen people with college degrees in IT employed as programmers that literally cannot program. I'm not talking "bad programmers" or "brain fart moment", I'm talking "consistently being unable to grasp even basic control flow over a period of months or years". Also some good programmers can be hard to work with for reasons other than their programming ability.

Your link talks about "good programmers that lack social skills". In my experience, politeness is a finite resource and dealing with people on a regular basis fully unable to do their listed job is a severe tax on mine.