What the study actually finds is, yes, myocarditis and pericarditis only happen in adolescents that are vaccinated, BUT that this is offset by significantly low

What the study actually finds is, yes, myocarditis and pericarditis only happen in adolescents that are vaccinated, BUT that this is offset by significantly lower hospitalization rates in the vaccinated. They also do not find that all myo and pericarditis cases required hospitalization. The study does NOT look at long-term issues related to either the vaccine or the (usually temporary) myo- and pericarditis, (nor due to long-COVID), and since most cases of myo- and pericarditis resolve, this still for sure means, on net, that the vaccine reduces hospitalizations. Insofar as most studies tend to show that the long-term sequelae are significantly worse than the long-term sequelae of the vaccine (even if you get temporary myo/pericarditis), it is almost certainly the case that, if you know there is a decent chance you will catch COVID (and there is), there is more risk not being vaccinated than from vaccination. The only exception to these findings, broadly, that I am aware of, are in severely immunocompromised individuals lacking e.g. B-cells or T-cells, where, there, the effectiveness of the vaccine can be too poor to recommend. For everyone else, it is clear the vaccine reduces risk (though this reduction is far less than we might hope, obviously).