Plenty of ~intelligent people on HN and elsewhere, who would never sign up for a Gwyneth Paltrow detox regime, talked themselves into believing that there was some forbidden knowledge being exposed by these quacks. It was always so transparently silly.
"Strong convictions loosely held" is an admirable way forward on testing everything we have to save lives. Unfortunately when it became so politicized and the unethical doctors and scientists realized they could print money by claiming they had a secret cure being suppressed, the "loosely held" bit was left behind.
I'm afraid that this is thanks to political tribalism. Especially in the system where you have only two sides.
And imnsho a bigger problem: that they were in turn trying to dupe others. This amplification effect is at least as harmful as the initial fraud.
Also people really want to "own the libs" at any cost.