2. Rules that keep people from harming others are very important.
u mean mandatory vaccination?
u mean mandatory vaccination?
Which diseases and how wide the requirement tends to be context-dependent. MMR in school, for example, is generally justified because school attendance is mandatory, so forcing people to be in an environment where a preventable disease will spread is inhumane if the spread can be stopped.
COVID-19 vaccination doesn't guarantee a person cannot become infected or infectious. It significantly diminishes spread (a person stricken with the virus and extremely symptomatic is more contagious than a person who is carrying the virus but asymptomatic; mechanically, coughing, sneezing, and gasping for air with fluid-filled lungs sprays more virus-laden particles into the air; it also seems likely that a vaccinated person who picks up an infection throws fewer virus particles in regular breathing, though the studies that I've seen seem to have mixed results on that).
The other reason to vaccinate people is load on medical services; even if someone who is vaccinated is infected, the odds they'll get so symptomatic they wind up in the hospital go way down. Hospitals filled with COVID-19 patients have far fewer resources to dedicate to "everyday" emergencies (heart attacks, car crashes, etc.)... The result being that COVID-19, left unmitigated, can cause systemic collapse of a country's health infrastructure and resulting death due to preventable conditions (because there's nobody available to prevent them).
It's easy to forget (now that most people are vaccinated) how virulent this virus is, and how severe the symptoms are, unmitigated. There's a good reason the world medical community snapped into action on this one.
But keep in mind we've had mandatory childhood immunizations for decades and almost everyone supports them.