People refusing to wear masks rarely question whether or not it works, and more to do with a low estimation of the disease's threat, as well as contempt for both the technocrats who chose to mislead the public about masks early on, and leaders who they believe are overstepping their authority by mandating them.
Our leadership has been doing everything possible to burn through its perceived legitimacy, and this is the result. Childish, spiteful, somewhat understandable behavior.