Moral philosophy: why an ethical governance must require vaccination

• An ethical state/government/authority must protect the health of the public. 
• Protecting the health of the public is hard-to-impossible if the health-care system is overwhelmed.
• With high probability, severe/protracted/deadly cases are more likely for the unvaccinated. That's scientific fact.
  
• Therefore with high probability, the unvaccinated are bound to overwhelm the health-care system in a severe, highly-transmissible, pandemic.
• Therefore in a severe highly-transmissible pandemic an ethical state/government/authority must require vaccination (in conjunction with all the other necessary measures such as mask mandates or maintaining social distance).
• In particular, this applies to the COVID-19 pandemic, which is severe and highly-transmissible. That is supported by the available data (277 million cases and 5.38 million deaths worldwide reported as of 12/23/2021).