Think of all the Freepers who said there was no way SARS-CoV-2 proteins could get into the blood or be excreted in breast milk.
The point is these are experimental injections and there is much to be learned about the effects, the effectiveness & long term effects. Could there be safer approaches than injecting an experimental compound into hundreds of millions of people, an approach like ivermectin? YMMV
Xiao Bi Deng says that I’ll be sorry for refusing the vax. Since that dementia-addled old fart has a nearly perfect record in terms of being wrong about everything, I like my chances.