I agree that those studies should be done. Studies should ALSO be done on people with unvaccinated covid infections, but we can’t do that on a large number of people, because they’re dead. The vaccinated people might have a ‘non-zero risk for blood clots’, but they’re still alive in the meantime.
It took me way too long to realize this was supposed to be a joke because Hg is the chemical symbol for Mercury. Such an easy thing to mishear.