Simply put, there is overwhelming evidence that the SARS-CoV-2 spike protein (that is also synthetically produced by the Covid vaccines) is a central part of the mechanisms of morbidity and mortality of SARS-CoV-2, and therefore is also a risk of the vaccine. In regard to clotting, that risk is greater if you receive a vaccine.
The data clearly demonstrate that the last thing you would ever want to do is make a vaccine that produces a spike protein. As the literature clearly showed, it would cause significant damage, including brain clots and death. And that literature, for the most part, was available before the release of Covid vaccines to the public.