Your own link shows 128 cases of myocarditis within 7 days of ~2m vaccinations for 12-17 year old males, against an expected rate of 0-4. That's an overall rate of 1:15,000. And that study is based entirely on people with severe enough side effects for them to end up in the hospital following vaccination and to consequently be diagnosed with myocarditis, and only within 7 days. In other words it's definitely lowballing the figure.
And it's things like this that destroy trust. Because we're already speaking of an unacceptably high rate of severe side effects, based on this single one (amongst many possible), for that demographic. Typical rate of severe side effects from vaccines are in the 1:1,000,000 rate. So why was this recommended, and defacto mandated, for that age group, again? And where's the accountability for those that made this decision, and for the trials that failed to make clear such extremely high rates of side effects?
I realize I'm going on a slight tangent instead of arguing my rather extreme claim. The point I'm making here is that the messaging on these vaccines has not been carried out in good faith, and that they do have clear and severe side effects that should have made them a non-starter for at least certain demographics. And as we continue to see excess mortality rates that are comparable to what it was mid-pandemic (during the lulls between spikes), the possibility of longer term side effects seems to me to be, at the minimum, viable.