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One in 5,000? I wonder if ethnicity and/or prior infection played a part.

Just a reminder, almost 90% of America is vaccinated at this point in time, most adults for at least 2 years (70% by Aug 2021). Those age 16 and older were given the green light in Aug 2021 or at the maximum, 17 months. In addition to lowering the risk of Coronavirus-related myocarditis and heart damage, many lives of adults have also been saved through wide-spread acceptance of vaccination drives.

For what it’s worth:

“During March 2020–January 2021, patients with COVID-19 had nearly 16 times the risk for myocarditis compared with patients who did not have COVID-19, and risk varied by sex and age.
https://www.cdc.gov/mmwr/volumes/70/wr/mm7035e5.htm

In the COVID-19 group, 79 (0.12%) patients had new-onset myocarditis compared to 29 (0.04%) patients in the non-COVID-19 control (Pneumonia/flu) group
https://pubmed.ncbi.nlm.nih.gov/35265414/

“Conclusions:... Young males infected with the virus are up 6 times more likely to develop myocarditis as those who have received the vaccine.
https://pubmed.ncbi.nlm.nih.gov/34341797/

“DALLAS, August 22, 2022 — In a detailed analysis of nearly 43 million people, the risk of myocarditis in unvaccinated individuals after COVID-19 infection was at least 11 times higher compared to people who developed myocarditis after receiving a COVID-19 vaccine or booster dose, according to new research published today in the American Heart Association’s flagship, peer-reviewed journal Circulation. This analysis included data from England’s National Immunization database....
https://newsroom.heart.org/news/myocarditis-risk-significantly-higher-after-covid-19-infection-vs-after-a-covid-19-vaccine