"Absolutely zero risk" is simply nonsense. A number of quite healthy people have died, including a just-elected US congressman. Many more have been hospitalized.

The risk of death is a lot lower in healthy people, but not zero. In addition, there have been reports since the start of damage in healthy, even asymptomatic people, such as high rates of radiologically detected pulmonary fibrosis. There is also "long COVID."

On the other side of this, you are implying a significant risk from a vaccine that has been tested, at this point, on many tens of millions of people. Furthermore, mRNA vaccines are relatively new, but they have been being tested for quite a few years.