Comment by m12k

There is a relatively small group of companies/people who know better, but would lose billions if this problem is addressed, they have an army of lobbyists and media companies to push the hoax/not-our-problem-narrative, and finally you have a huge undereducated part of the population who are already skeptical of 'elitist' scientists even before the manipulation begins. This problem also seems to be more extreme in the US compared to other western countries due to e.g. the prevalence of Fox News and decades of creationism leading the anti-science crusade. All in all, you can't really count on having a shared definition of 'reality' any more, as this has now been politisized.