Well yes, NK cells do that when we're infected with a malignant infection.
For the last hundred years, or so, vaccines have been non-malignant, so we've never had to question such things.
However, mRNA vaccines are an entirely novel class of technology, so it's appropriate for us question:
a) how long mRNA vaccines persist in the body?
b) how discriminating are mRNA vaccines in which cells they impact?
c) if any testing was done on the side effects of accidental intravenuous injection of mRNA vaccines? (given that there are plenty of blood vessels in muscle tissue)
d) if any longitudinal studies have been done on mRNA vaccination of humans?
e) if any comprehensive studies have been done on pregnant or nursing women injected with mRNA vaccines, and the impact on their infants?