The best explanation of what has happened is that Florida’s vaccination rates were good, but not good enough for its demographics. It has so many older people that even vaccinating a vast majority of them left more than 800,000 unprotected. Vaccination rates among younger people were uneven, so clusters of people remained at risk. Previous virus waves, which were milder than in some other states, conferred only some natural immunity.

And Florida is Florida: People have enjoyed many months of barhopping, party-going and traveling, all activities conducive to swift virus spread.

Unlike in places like Oregon, which is clamping down again, adopting even outdoor mask mandates, Mr. DeSantis continues to stay the course, hoping to power through despite the devastating human toll. A Quinnipiac University poll released this past week found that Mr. DeSantis’s approval rating was 47 percent.