You need a basic understanding of immune system function and what vaccines actually are in order to understand what is going on physiologically.
First, a vaccine is the inactivated or attenuated virus. Thus, the immune system is responding to it the same way as it responds to a live pathogen, as far as antibody production goes. It is not the vaccine, but the response to challenge with a pathogen that causes the rare autoimmune reactions. As a researcher, I would want to understand why the immune system failed to prevent the formation of self-recognizing antibodies. No way am I going to jump on an anti-vax bandwagon just because people do not understand immunology or vaccines.
Basic understanding? The FDA has proven repeatedly over its existence that it is not omniscient. 6-in-1 may be convenient and cost-effective, but I’d argue the jury’s still out on whether or not it’s good medicine.
I repeat, you are fighting a battle with yourself. You have not understood the points of the others on this thread. Be at peace.