We seriously need to straighten your numbers out.
To clarify: 234,000 under 18s were hospitalised for covid between Autumn 2020 and Spring 2024,
according to the AAP. This number formed the basis of your 0.3% stat, because 234k is ~0.3% of 74 million, which is the
total population of that age group.
We then took 2% of the 0.3% for a rough estimate of the arrhythmia incidence, reaching 0.006%. But a 0.3% incidence within the hospitalised group means a 0.006% incidence in the
total population. That is an overestimate of the sample size. You yourself conceded that a full 5% -- almost 4 million! -- may not have had covid during that timeframe.
And as we know, an overestimate of the sample size would lead to an underestimate of the prevalence.
On the other hand, the numbers used for the 0.0005% increased risk of myocarditis are
not from the total population. That is 0.0005% specifically of recipients of that vaccine.
....And yet, even if we ignore how grossly mismanaged your stats are,
we still end up with myocarditis from the vaccine being the lower risk by an enormous margin.
I make no
claim outside of what is well-established science. You are the one arguing that T-Cells and B-Cells will last indefinitely and never wane in certain subgroups, which would be an inexplicable departure from their behaviour in every other group. That is most definitely the positive claim here; it steps wildly outside anything established.