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Because it's a o e sided question. Why not also question if he was infected by corona virus? You know the virus that has a documented effect on the health of the heart. And the moment both groups are pretty large, the vaccinated and the least once infected with corona but the virus is never a suspect in certain groups. Blood clots, myocarditis etc. is only ever attributed to the vaccine and not the virus.
Sure, it is legit question. But for me personally not relevant, because I know more previously healthly people dead/serious ill because of vaccines and just one (obese) dead because of covid. I prefer to gather non-anonymous and non-generalized examples.