Why?
Look I know we've all heard the Friedman quip about temporary government programs, but that refers to normal situations. It's one thing when a program might drop off the political radar and outlast its mandate by decades, but in the case of COVID-19, there is absolutely no way on Earth, at all, that people could just forget that it happened. If the COVID-19 pandemic were a war, it would already rank among the 50 deadliest ever.
Our rights are not devalued in the long term by rapid action in a pandemic which, by the best available estimates, could kill over a million Americans if left to run unchecked. They are not devalued in the long term because it is always going to be easy for people to know whether we are experiencing this kind of emergency. The loudest deniers on Facebook are not representative of the population: most Americans do recognize the threat, despite one of the largest disinformation campaigns in human history.
So what if there's a small chance we might be too strict about masks? It's not a large injustice, and it's not a slippery slope.