That's what I thought. Comic publishers want kids, especially kids, and general audiences to take the pandemic seriously.
However, I think if DC and Marvel, and/or any of the other major comic book publishers, made PSA comics centered around it that featured superheroes and/or supervillains that would drum up a LOT OF COMIC BOOK SALES.
9/11 was a major world-changing event, as were other recent terrorist attacks, but they didn't impact anyone's personal health. Yes, a lot people were killed and injured in 9/11 and in other terrorist attacks but the world moved on. I don't know about how many casualities there were in the other attacks but I doubt that in total including the ones from 9/11 that the count was anywhere in the millions. People weren't required to take personal safety precautions to protect their health.
There were a number of other pandemics and epidemics that transpired in recent years but how come they weren't nearly as bad as the Covid-19 pandemic?