I hear what you are saying but I can see this spiraling out of control. What happens when global warming and over population is considered to be a dire threat to the continued existence of human life? Do we allow hospitals to refuse services to women on their third child or men / women that refuse to be sterilized after the government approved x children. Seems far fetched but our definition of clear and present dangers can shift over time to fit the scenario something similar has already happened in China. I am very much not for allowing institutions to make those sort of decisions regarding the care provided to people as entities don't usually relinquish power once granted.

Edit: I am ok with triaging the vaccinated over the unvaccinated in a scenario with limited space as mentioned by another poster below.