It was only a few days ago that we added to our ongoing reporting on COVID-19 vaccine negative effectiveness (the notion that the jabs make COVID-19 infection, and even death, more likely), and now we can add to that some more evidence and a source from the mainstream news.
Yes. The answers to your questions is simple - "ignorance".
That is indeed the first answer one should entertain. There does come a point, however, when it must be more than that.