1. The President is chief citizen. This means the President should represent all of the people of the United States. Citizens expect the President to work for their interests and provide moral leadership. During a pandemic, the POTUS should try to protect the citizens. Biden has made vaccine mandates to make sure that more citizens don't suffer or die from Covid and the new variants. We know that 95% of people in hospitals for Covid have NOT been vaccinated.
2. There are all kinds of mandates from the government that are designed to keep us safe, such as speed limits that are known to save lives. There are also mandates prohibiting using drugs or alcohol while driving for the same reason. Workplace safety laws are enforced by the Occupational Safety and Health Administration, and so on.
3. It's immoral to allow people to suffer or die and to allow them to infect others for political reasons ... The POTUS has to act in order to reduce suffering and death, as it's the only moral thing to do. Individual liberty has to be balanced against public safety. Not being vaccinated is a clear and present danger to us all. Biden did good.. and will be heavily criticized by those who for whatever reason, still agree with Trump's laiser faire covid policies.