Is COVID19 the biggest scientific failure of the generation?

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>Mask doesn't work
>Mask actually works
>Mask doesn't work again

>Get vaccinated
>Akhstually vaccine wane in efficacy and needs booster
>People with natural immunity still needs vaccine

>Lockdown, get inside
>Akhstually being outside reduce your chance of getting covid

>Herd immunity is attainable
>Herd immunity is not attainable

Why are the medical community so incompetent? Are other scientific discipline responsible for major public policy decision like climate, economics, energy also equally incompetent?