The authors seem to think the ultimate problem is skeptics deftly using data to mislead social media users.
At no point, they were told, was it acceptable to doubt the mainstream understanding of the pandemic, even though that understanding evolved almost weekly over the course of 2020. The study authors clearly didn't grasp this important point [...] They compared anti-masking advocates to critics of evolution, arguing that "their simultaneous appropriation of scientific rhetoric and rejection of scientific authority also reflects longstanding strategies of Christian fundamentalists [...]".
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Summed up, this is an interesting study that contains some helpful insights. But it won't have its intended effect because the authors refused to follow their analysis to its logical conclusion: Americans were misled by their leaders. To win back their trust, we need to treat them as fellow citizens to be convinced, not subjects in need of prodding.