More Chicken-Little-ism:
1. Myocarditis is an effect of the immune system fighting something - viruses, bacteria, etc.
2. Myocarditis is very treatable, is treatment is even needed.
3. 1200 cases out of ~160 million having received at least one dose of Pfizer or Moderna (177.6 million have received some vaccine, I allowed 17.6M for the fact that some were from J&J) and ~133 million who are fully vaccinated with Pfizer or Moderna. Using 133M to get the larger percentage, those 1200 are .0009% of those fully vaccinated with Pfizer or Moderna. That ASSUMES every one of those 1200 cases were due to the mRNA vaccines rather than by some unrelated cause.