Tbf, they could have done something about covid. Not really a point in humanity's favor. But there's extremely little, really, that the average person can do about environmental collapse. I think it's natural that they just become accustomed to seeing the big numbers and gradually tune them out. Could be assholery. Could be helplessness transmuted into despairing apathy. But they're eventually going to stop reporting the deaths too.
We also had millions of people throwing the most embarrassing tantrums over covering their disgusting faces with a piece of cloth for a while. And those big measures weren't big enough it turned out. As a whole, I rate the humanity's response to a pandemic as "meh".