Covid19 - Questionable logic of mRNA vaccines

 The human body is made to reject foreign tissues, matters, virus or bacteria etc etc. This is the main problem of tissue rejection in transplant cases. But the body will not reject whatever it produces as the tissue or matter would have its own genetic or DNA code that the body would regard as its own, no rejection means no antibodies produced to destroy them.

The basic assumption of mRNA vaccine is to introduce spike proteins of the coronavirus into the body during vaccination. The mRNA, the messenger would then trigger the body to produce more spike proteins. Next the body would have to produce more antibodies to destroy all the spike proteins, introduced into the body or made by the body.

The part about the body producing antibodies to attack the foreign spike proteins introduced into the body is an accepted and acknowledged natural process. What is questionable is the body producing antibodies to attack the spike proteins it produced when triggered by the mRNA. Is this the case? Biologically this should not be the case as the spike proteins produced by the body would not be seen as a foreign tissue. The big difference, foreign spike proteins are foreign. Spike proteins produced by the body have the body's genetic code, ie not foreign. There is no tissue rejection problem.

If this is medically and clinically correct, the mRNA vaccines would only be effective in the first phase, ie, the body producing antibodies to fight the foreign spike proteins.  The second phase of antibodies fighting the 'body produced' spike proteins could be redundant, might not happen at all, same body tissues.

What could happen is that the foreign spike proteins would be destroyed, but the spike proteins that the body produced could continue to live inside the body, co exist as part of the tissues of the body. The question is, would this be continuously produced by the messenger RNA and accumulate in the body? If it does, what then, would the spike proteins be causing mischief in the body?

The logic of the body attacking its own tissues, in this case body produced spike proteins, is a moot point. Would it, does it? The body does not attack and destroy its own tissue unless it goes berserk.  If not, would the spike proteins produced by the body be harmful to the body if not destroyed? The only exception so far is malignant cancerous cells, cells that have gone berserk. But the body's defence system against cancerous cell is weak, maybe for the same reason, own tissues.

The body produced spike proteins may be harmless to the body that produced it.  But it is still spike proteins, and if not destroyed, could be spread to others. And other bodies would reject and fight it as infection, covid virus. This could be the reason by vaccinated people are more dangerous and carriers and spreaders of the virus, with body produced spike proteins, not destroyed by the original host body but still spike proteins of the virus. Logical?