Facebook says my recent column about face masks is "missing context" and "could mislead people," based on an assessment by "independent fact checkers." That judgment and the analysis underlying it show how reflexive deference to government agencies distorts supposedly "independent" summaries of scientific evidence on controversial issues, especially issues related to COVID-19 control measures. When one of those agencies gets something wrong, criticism of its position is apt to be labeled "misleading" on social media platforms that strive to police COVID-19 "misinformation" at the government's behest, regardless of what the evidence actually shows.
My column summarized the results of January 30 Cochrane Library review that considered 18 randomized controlled trials (RCTs) aimed at measuring the effectiveness of surgical masks or N95 respirators at reducing the spread of respiratory viruses. Judging from those studies, the Cochrane review found, wearing a mask in public places "probably makes little or no difference" in the number of infections. The authors said that conclusion was based on "moderate-certainty evidence."
