Sample email:

Dear Dr xxx -

In response to <hospital>'s demand that all organ transplant recipients receive covid-19 vaccinations, I am removing myself from the organ donor program and urging friends to do the same.

I hope you care that the hospital's decision is already causing harm to patients by decreasing the number of registered organ donors.

Please do your part in rescinding this harmful, short-sighted demand, and hopefully my organs won't go to waste.

Love, Me

Shame them.