As someone with a PhD in pharmacology and worked in the pharmaceutical industry: pessimism and skepticism are the right attitudes in drug discovery, most things don't work.
I have dim memories of alternative medicine hippy types pushing hydroxychloroquine and zinc as cures or prophylactics for flu and colds. Which set off my bullshit detector big time. The other thing is for a drug to be a game changer it'd need to reduce mortality by 90% and if that were the case with hydroxychloroquine the Chinese would have seen that in January. But that's exactly what people were claiming. Yeah no dice.