There is a fundamental difference between the J&J vaccine which causes adverse reactions and the Pfizer and Moderna vaccines which cause adverse reactions which is why the CDC has advised not using the J&J vaccine anymore. The difference is that the NIH has a stake in the Pfizer and Moderna vaccines and makes money when they are used, they do not make any money from the J&J vaccine, so as you can see myocarditis from J&J is fundamentally different from myocarditis from Pfizer.