That's some other goalpost (with regard to mandating vaccinations). Vitamin D clearly does protect people by a significant degree and it is not mandated.
> and even if you’re a complete sociopath who doesn’t care about the human cost
Or on the opposite end of the spectrum, a complete sociopath who does not care about overriding people's personal medical decisions and moves the goalpost over and over in order to achieve that goal as we were able to see in popular media during the pandemic.