That's science working as intended: theories getting replaced by better theories. There is plenty that we are probably going to find out more about in the future that will invalidate some of what we believe today to be true. But that's fine, as long as we stick to the scientific method that will all come out, even if it takes a while. Science has brought us further in 400 years than anything that came before. Right now it has given us vaccines, which are the best way to deal with COVID-19, and the anti-vaxx crowd and the pro-hydrochloroquine and pro-ivermectin crowd show large overlap.
Fortunately during the polio years we didn't have the internet, the carnage would have been incredible.
Fortunately during the polio years we didn't have the internet, the carnage would have been incredible.