The first thing wrong with it is that it's yet more stuff about Trump and Mueller, and the world already has far too much of that. In a sense it isn't really about Trump though - he's just the peg to hang off "thoughts" about the Evil Right Wing (DR's Left Wing is much nicer) and then a tiny bit of climate at the end.
I imagine that you (well, except for RS) like me can never remember what all the wanky Philosophy words like Ontological and Epistemology actually mean. DR thoughtfully explains that Epistemology is the branch of philosophy having to do with how we know things and what it means for something to be true or false, accurate or inaccurate. And further notes that The US is experiencing a deep epistemic breach, a split not just in what we value or want, but in who we trust, how we come to know things, and what we believe we know — what we believe exists, is true, has happened and is happening. And that I think is reasonably fair, though I think if you probed it more deeply you'd find extensive areas of shared agreement. I'm pretty dubious about The primary source of this breach, to make a long story short, is the US conservative movement’s rejection of the mainstream institutions devoted to gathering and disseminating knowledge though. DR's free pass for the left wing doesn't seem terribly plausible to me.
But anyway, what this all ends up meaning is that you can't win arguments on the internet. Which those of us who've been arguing on the internet for a while have already noticed. It isn't particularly new; that there are partisans for causes who cannot meaningfully be reasoned with is familiar to anyone who has commented at WUWT and elsewhere. There are many many problems but one of them is that any given issue can (and must be, if you want to nail down anything) be hair split into so many parts and chased down into so much detail that if you've wasted vast time finally nailing down the most carefully hair-split detail, then (a) all the audience has got bored and left, and (b) you've only settled the tiniest fingernail of uninteresting detail. And of course "winning" on that one point of detail does you no good, because no-one has any honour; "losing" a point means nothing; it establishes no precedent for trustworthiness or otherwise.
Mind you, I also think he is wrong about his case: US institutions are stronger than he gives them credit for. But I'm not at all sure this kind of hand-wringing is useful; helping strengthen those institutions would be better. Perhaps that's what he thinks he is doing?
Of course, if you don't like disliking DR, you can always dislike the American Enterprise Institute instead; the post and comments there provide a nice example of the problem. You'll wonder (I hope) how I got there; the answer is via Cafe Hayek who, whilst a nice economist, is rather naive about GW and the truthiness of Patrick Michaels.
* Mark Jacobson Abandons Science, Takes Up Barratry - mt
* A Mind Böggling Development In Energy Storage & Zeppelin Parking - RS
* ATTP joins the epistemic bandwagon: Jordan Peterson speaks the truth.
* ATTP again with The Black Knight.