Vaccines work really well, so well that we can show benefit even when confounded by hundreds of other variables both known and unknown. Obviously the universal

Vaccines work really well, so well that we can show benefit even when confounded by hundreds of other variables both known and unknown. Obviously the universal mask mandate has not had such a strong success and it becomes really hard/impossible to measure effectiveness in the face of all these other confounding variables. Edit: there is a lot of pseudo-science on all these matters motivated by biases.