I made no claims about the EMH. My only claim is that if bias like what you describe exists, it's something that statisticians rather than politicians need to i

I made no claims about the EMH. My only claim is that if bias like what you describe exists, it's something that statisticians rather than politicians need to identify and fix, and that the statisticians in the position to fix it have perfect incentives to do so. Politicians have neither the ability nor incentive. Similarly, if someone were claiming that we need political oversight of UI/UX choices, and that American web pages need more red/white/blue to improve conversion rates, I'd suggest that this is a job for web designers rather than politicians. I'd also say that if you just want red/white/blue designs for patriotic purposes, you should openly advocate for that and not talk about conversion rate.