It's true the Charles presented a large number of claims without the evidence to support them. But I've engaged him on other issues. (You can find the discussions on the forums here.) His is a formidable and educated intellect, though neither he nor I are used to arguing from the soapbox. Someone arguing from the soapbox doesn't bring in the whole fabric of issues that he sees related, and that his opponents don't. Someone arguing from the soapbox focuses on a single, supportable point and rallies people around it.
You may disagree with Charles, but you should understand already, as a matter of public discourse, that everything in that 'rant' has evidence to support it. You may disagree; you may think the evidence of no account. You may think the conclusions the result of bigotry. But others don't, and the 'of course you don't believe that' argument has been used so often that it marks you as someone who prefers to dismiss evidence rather than examining it, and to dismiss people rather than taking them seriously.
The 'of course you don't believe that' approach keeps us talking past each other. It keeps us from actually examining the evidence the other brings. It confirms our confirmation bias. At best, it is an argument from solidarity: "Be one of us, not one of them." It is inherently polarizing. Can you complain of polarization, when you reject any attempt to meet the minds of the other side?
Wolfgang Pauli could say, "That's not right. It's not even wrong," because he was talking about math and the physical sciences, and had an established and shared understanding that was supported by tens of thousands of experimental results. We don't have that in public policy, and it's near certain that none of us has the skills of a Machiavelli or Metternich that would give us the authority to say, "That's not even wrong." We have contradictory exemplars and cases, and we need to sort through them to find the truth.