You don't have to buy it, that's what moral relativism implies.
Ultimately I think you're arguing that the greater public good invalidates personal freedom and body autonomy. I disagree with you, as many others would as well.
Comparing the MMR requirement for public school to taking experimental vaccines with vastly worse safety profile being a requirement to engage meaningfully in public life at all is a gigantic stretch.
I don't know why people deceive themselves that these are similar in any way.
> And businesses making their own employment choices.
Does this include a federal government vaccine mandate?
> Vaccine mandates are nothing new - I was required to get vaccinated to go to my public school.
An appeal to tradition/authority doesn't make it any more tenable. The anti-mandate position is precisely (at least in part) that they should have autonomy over their own body.
> You literally said the "best" choice is relative. Your entire stance is deeply relativistic at its core.
You're having a discussion with two different people. The comment you're responding to was not me. We are making different points.
Sure they might have different principles than me. So do people who support child marriage in India.
I have no qualms about outlawing child marriage though. Maybe that is ultimately relative and maybe it is western arrogance. I'm fine with it.