"For boys 12-17 without medical comorbidities, the likelihood of post vaccination dose two cardiac adverse event is 162.2 and 94.0/million respectively. This incidence exceeds their expected 120-day COVID-19 hospitalization rate at both moderate and high COVID-19 hospitalization incidence."
https://www.nature.com/articles/s41591-021-01630-0.pdf
"myocarditis after vaccination was higher than myocarditis after sars-cov-2 infection for people <40"