I mentioned this elsewhere, but people on HN eat up the argument of "do your own research, make up your own mind" as an excuse for not challenging even obvious the most obvious BS.
I don't know about you, but I don't have the time to do quality research of every guest he has on. Even if I did, I can't match the manpower or experience of a professional media outlet to do even basic fact checking. For stuff that isn't decided fact, I also don't necessarily have the breadth of knowledge to even know where to look for the competing opinions on a subject.
If I, a student, don't have the time to do that research, then what percent of a percent actually does? Like I was describing, what small fraction of that can even do that research effectively? My guess is that it goes to zero pretty quickly with the complexity of the subject.
That might not be a problem for the most controversial guests where I already have my defenses up. But, what about the more subtle guest who is pushing extreme views based on literal misinformation, but sounds plausible enough that I buy into it?