How can you tell which studies are right and which ones are wrong?

A large study in the UK shows only vaccinated kids got myocarditis. But the medical community claims that the risk is higher from COVID. They can't both be right.

https://kirschsubstack.com/p/how-can-you-tell-which-studies-are?utm_source=post-email-title&publication_id=548354&post_id=150033866&utm_campaign=email-post-title&isFreemail=true&r=1kgqm5&triedRedirect=true&utm_medium=email