But I'm fairly confident that Darwin's "survival of the fittest" still applies.
Where "fittest" means those (groups of) people which are better informed than their science-denying peers. And as a result, better equipped to deal with the many challenges of life.
Here on HN, it shouldn't need explaining what effect even small differences in "fitness" can have over a # of generations.
Erodes trust.
It's not like this is only related to Covid. You can see people "doing their own research" on climate change as well, without knowing the basics of science, physics, systems science or actual climate science, but they've watched a podcast or read a blog. Covid just made this bro science stuff so mainstream that it's hard to have a beer in a bar without hearing about it.