I'm one of the people who've experienced this (exceptionally rare) side effect personally. I was hospitalized twice after my second Pfizer dose (in Australia). I'm still recovering. It sucked. It still sucks.
And I'm still very happy to be vaccinated. I do not at all regret my vaccination. The EV of a covid vaccine was, and is, hugely positive. I drive to work, I've run two marathons, and I've been scuba diving dozens of times. All are riskier, overall, than the vaccine.
Even if 100% of the ~12.6 in a million cases of myocarditis from the vaccine had resulted in death --- which, let's be very clear, they absolutely have not --- it would still be a risk worth taking. Your per year chances of dying from homicide in the US are 3-4 times as high.