It's economic theory, but there are costs associated with everything. What we choose or what we don't have costs associated with it. Economists assume that government tries to makes rational decisions under conditions of uncertainty.
Ryan Bourne makes the argument that current mask mandates impose unacceptable costs today that they did not impose last year.
As soon as the Centers for Disease Control and Prevention (CDC) recommended that vaccinated individuals wear masks indoors in areas of “substantial or high” COVID-19 transmission, you knew the re-introduction of mask mandates in liberal cities was inevitable.
It is worth the read, and the argument is complicated, as most economic theory is. But basically, now that the vaccines are widely available at very low cost, then those to remain un-vaccinated have made a rational decision and that the costs associated with that should not be borne by the general pubic at large.
You may not like economics, but economics reveals human behavior in many ways that other sciences don't.