You seem to have a hard time realizing that this discussion is about rare incidents of myocarditis that are related to covid vaccines.

The first link you provided, which talks about myocarditis in general rather than its relationship to covid, indicates the condition is generally manageable: "Most cases of myocarditis are self-resolving. Other cases recover several months after you receive treatment. In some cases, this condition can recur and can cause symptoms related to inflammation such as chest pain or shortness of breath." https://www.hopkinsmedicine.org/health/conditions-and-diseases/myocarditis

Your second and third links don't mention myocarditis, SARS-cov-2, or covid, so they aren't really relevant to this discussion.

The rest of your opinions are unsupported so - while you're certainly entitled to them - they're just your opinions.

"The known risks of COVID-19 illness (including complications like myocarditis/pericarditis) outweigh the potential harms of having an adverse reaction following mRNA vaccination, including the rare risk of myocarditis or pericarditis which despite hospitalization, is relatively mild and resolves quickly in most individuals." https://www.canada.ca/en/public-health/services/immunization/national-advisory-committee-on-immunization-naci/rapid-response-recommendation-use-covid-19-vaccines-individuals-aged-12-years-older-myocarditis-pericarditis-reported-following-mrna-vaccines.html

To propose that the risk of myocarditis/pericarditis is serious enough to warrant not getting the vaccine is equivalent to shouting "FIRE" in a crowded theatre. It's possible that some people are sincere in their concerns but misinformed. It's also possible they're just vandals, shitposting for the fun of it, or trying to drum up some advertising revenue from their social media pages or some speaking engagements.