You also had a pair of "platforms" called "mRNA" that the companies had been trying to use for other things -- specifically, against serious chronic diseases (didn't I just comment on that? I think I did.) They didn't work; using doses large enough to provide benefit in animal testing they all failed on toxicity concerns; in short you couldn't keep the therapy only where you wanted it and when it inevitably got into other places it did harm. The companies in question pivoted into the idea of vaccines (there are many in the pipeline for these, incidentally) on the belief that doing so would allow much smaller quantities to be introduced and thus avoid the toxicity problem.
This is an extension of the dilution is the solution to pollution claim. It is true at a certain level, but the problem is that at that level you may well get no effect either. We're not talking about 10 half-lives or similar here where you go from 100% to one part per billion. Further, and perhaps more-importantly, this is a class of viruses that has never been successfully vaccinated against before, joining HIV and RSV along with a few others. The basic science on this virus and its components was simply not done before decreeing that the alleged intended agent of recognition (the spike protein) was harmless standing alone. We now have hard science this is false, and in fact had indications of that science, all the way back to September of 2020. This paper along with several others now show that the S1 component alone, without the rest of the Covid-19 virus, can cause clotting disorders.
The next claim was that the "spike protein" would not show up in the circulation anyway when you were inoculated. That turned out to be fanciful bull**** as the entire spike protein has now been identified in the blood two weeks after the shot was administered and there was no nucleocapsid present, so the alternative, that the person got infected naturally in the interim, is excluded. In other words we now know that a believed-dangerous thing, both S1 and the spike protein as a whole, winds up in the circulation as a direct result of inoculation in a significant fraction -- about one quarter -- of those who get jabbed. Not only was S1 detected in the blood well above baseline in a number of participants paradoxically the entire spike showed up in some inoculated persons two weeks later. Both of these things, we were told, did not happen, that claim formed a primary element of the safety claim of these inoculations and that it has now been proved false is a serious problem.