Is that so? 15% of Ohio State University athletes infected with COVID-19 had myocarditis. College level athletes? That's about as healthy as you can get. 48% of high school endurance athletes in another study showed signs of myocarditis after COVID-19 infection. The Big 10 screening found it in 2.3% of their athletes after COVID-19 infection.
If you're worried about mycarditis in your kids, they're definitely better off with the vaccine. And if you're worried about complications and death, over 300 kids under 18 have already died from COVID-19. 317 at the most recent count. Thankfully, it's very rare, but as you said yourself, it makes no difference how rare it is when it's YOUR kid, right?
Are you in favor of vaccinating kids who have already had the virus?