SA, I expect that the spike protein itself is indeed harmful. That’s why pieces of it are excluded from the more traditional vaccines, and from the mRNA of the mRNA vaccines. I remember that early in the pandemic some researchers described SARS-CoV-2 as “booby trapped” for vaccine designers. Maybe this is why some vaccines occasionally cause blood clots whereas others occasionally cause heart inflammation – note that both conditions are very frequently caused by SARS-CoV-2 infection itself, so they could well be caused by part of the spike protein.
I have heard that precisely which pieces of genetic material are included or excluded is “proprietary information” and withheld ie. concealed by the drug companies, though feel free to check me on that. But I believe that more transparency would help to prevent proliferation of conspiracy theories. Surely there should be a fully public discussion of every potential danger raised by every researcher. Such concealment seems reckless and highly unethical to me, as if each company is hoping that their competitors’ vaccines will prove less profitable through being less safe. It is entirely rational for suspicions to proliferate in such an atmosphere, especially given the drug companies’ decades long track record.