I'm vaccinated but I think it's hindsight bias to say the mRNA vaccines are obviously safe. We had to wait for clinical trials to show that. There has been a great deal of research and development on the delivery of the mRNA, what kind of molecule to wrap it in, for example. Additionally, and someone correct me if I'm wrong, but with e.g. the Spanish Flu, the morbidity was not from the flu, per se, but the immune res…
That said, I personally believe that the benefits outweigh the potential side-effects. If I weren't already vaccinated this news would not have have changed my decision to get a mRNA vaccine.
"Heart inflammation in young men higher than expected after Pfizer, Moderna vaccines -U.S. CDC" - https://www.reuters.com/world/us/cdc-heart-inflammation-case...