As someone who did choose to get the latest booster despite being a young male (highest risk group for myocarditis I believe), we should always be questioning what we put in our bodies.
I partially agree, or at least think we shouldn't be discouraged from questioning, but there's only so many hours in a day, and a person can digest a finite amount of information.
I choose to trust US health authorities. Flawed as they may be, I think it would be worse to somehow try to verify every claim, or come to my own conclusions on every single question. I won't judge you for making a choice different from my own, but for me, and I suspect many (most?) people, having a doctor who you trust, following their recommendations, and getting on with your life might be the best strategy.
Given the information i had at the time, I am fine with my unforced decision to get the first two doses, but I will not be getting a third barring some surprising new information, new variant, etc.
> we should always be questioning what we put in our bodies
If we did a better job of that, health problems associated with obesity, smoking, drinking, etc... would be reduced and that would have a pretty big impact on cardiovascular health too.