feralimal implies that people wearing masks aren't thinking for themselves, when the reality is that masks are in everyone's collective self-interest and the vast majority of people understand this. Widespread mask-wearing is highly correlated with reduced spread of airborne contagion, coronavirus included.
Exact proof of something simple as 2+2 is laborious and hilariously disproportionate but one can work with approximations well enough and handle the vast majority of cases in the same way friction and time dillation are often omitted from equations.