To cut-and-paste your own quote:
Why do they keep stating on official government documents (under penalty of law, loss of medical license, loss of career, potential prison time, etc.) that it was natural causes consistent with the person’s individual medical history?
Prove it.
On a case-by-case basis.
Well here’s two cases:
Marvin Hagler: https://www.usatoday.com/story/sports/boxing/2021/03/16/marvelous-marvin-haglers-death-reason-not-coronavirus-vaccine-wife/4715277001/
You have any where a medical examiner stated that the vaccine was the cause of death anywhere in the United States?