Joe is popular because he is (or at least comes off as) authentic. He doesn't (at least not ostensibly) bother to pause and think: ooh, am I the most influential podcaster in the world? I'd better be very tight-assed and responsible then, and think about how my words may impact the behaviour of my listeners:
No. Instead he speaks his mind, making sure to remind his audience, every once in a while, that he is just a regular dude, with only a couple of areas of proper expertise, one of which in martial arts, so they shouldn't take him too seriously. That's what makes him interesting.
Why does the righteous left lose its shit over this?