That was actually one of the key lessons I heard from virologists early on in 2020 - viruses like this tend to mutate quickly and escape vaccine-induced immunity. It wasn't until the vaccines were announced that the story changed and we were being told that the vaccines were effective and would only require one or two shots for permanent protection.
It got ugly because scientific study, and more importantly the limits of scientific understanding, was thrown out in favor of a more religious take on the whole field. Media organizations, late night talk shows, and even comedians were doing segments shaming anyone that was attempting to do their ow research (aka learn, consider the trade offs for themselves, and practice informed consent).
I had a coworker try to explain how 5G caused covid. Granted there is no technical reason why an EMF couldn't cause similar symptoms, there just wasn't any well founded research showing that and a much more simple explanation already had better scientific support (the novel virus).
Mockery is a tricky one though. Mocking any particular idea seems reasonable enough. Most people at the time were lumping in anyone that chose not to get the vaccine as an anti-vaxxer, wacko, conspiracy theorist, etc.
We in the US still haven't fully come to grips with the loss of over a million people to COVID. And now we're going to kick the can on proven public health measures, that have nothing to do with COVID, because of the off chance someone will become socially isolated / "less cool" to take care of their "freak" neurodivergent child.