That population didnt exist for very long. Once the conditions became that virtually everyone had at least one shot or one infection, is there any benefit with respect to myocarditis to getting more shots?
* I find it hard to trust data like this because of the immense pressure against side effects being attributed to the shots: pressure both on those impacted (for shame or disbelief or difficulty in knowing), on those doing the reporting (professional consequences, shame, disbelief), and on those in charge of administering the whole thing (monetary incentives, shame, disbelief, etc). That we see a signal at all in those conditions is frightening.