Okay. Clearly this discussion has drawn in the HN crank squad of denialist and anti-science nuts, so I'll cede this to them.
We have the greatest interpersonal communication capability the world has ever seen and we piss it away on insults.
It’s gotten to the point on HN where the “highbrow lowbrow” is dominating all discussion, because you can’t outright call a lie a lie here. It wouldn’t be “polite”. But it’s pretty easy to toss off a quick, thoughtless dismissal of any particular subject that sounds smart and polite.