There was not 10 years available to test the new mRNA vaccine, however 100s millions have taken the risk with a new technology and been vaccinated, with few side effects other than not one single vaccinated person has died from Covid.
If you think nobody has died from the vaccine or COVID after the vaccine you're really going to be shocked by the
VAERS data (over 2300 deaths so far, while this
Harvard study estimates only about 1% of people report to VAERS).
Or the
nunnery where all 35 sisters were never in contact with anyone, they got the vaccine then 2 days later they had a COVID outbreak that killed 2 of the sisters with 28 of them testing positive.