what-happened
GOLD
This where attention to detail matters. The argument isn't whether a large population is at risk for myocarditis, but rather a very small, healthy population is put in greater risk by administering a vaccine. It's a pillar of discussion during vaccine approval. There have been some studies done, some peer reviewed, some not. The gist is the risk of cardiac adverse events following the second dose of the mRNA vaccine could be around 3.7 times more likely than hospitalization due to COVID-19 in healthy 12-15-year-old boys. Plenty of other factors to consider that may tilt that in the opposite direction of you add 1 or more covid-19 comorbitidy to the equation.I notice that you don't use any numbers in your argument.
See previous note about people who make things sound risky by talking about the harm but never once mentioning the probability.
Bottom line, consider the risk/benefit for your boy child in regards to an mRNA vaccine. If I had a healthy boy child in that age range, vaccination would be out of the question, especially if they play sports or are active in cardiac intensive actvities.