Data provided for SAE in controlled tests is unreliable, thesuggestion that SAE is pretty bad is on basis of what we are seeing in the wild. This gets highlighted only by individuals who are celebs or have public presence that public will take note of.
For example, DiedSuddenly has documented cases amongst athletes, which is significantly big cohot of young healthy people.
What wiuld be this number? half a million to a million tops in the US. This particular cohort has seen numbers which are far bigger than 4 per million.
Now there are two ways to look at it. One that athletes go through a lot rigourous cardiovascular regime than normal person and they are more susceptible to SAE like myocarditis, second that similar SAE can be seen in non-athletes just that it doesnt come to limelight. That is scary.