I'd be quite happy if it was illegal to put HFCS in foods. For a few years now, I've not imbibed anything with HFCS in it, and that limits me to water, milk, 100% juice, and specialized sodas. I'd say it's less than 10% of the total "drinks" market. And I'm fine with that. Stop wasting sugar on ethanol and use the corn instead.
But there's no evidence supporting either of your claims.
The majority is always sane. Damage stops being damage if everyone has it.