To be honest it's a lost cause trying to talk sense into people like those above.
The fact that they deliberately don't even check-in to places, shows that this is far beyond that of an anti-vaxxer / anti-science / anti-medicine. It's tin foil hat territory.
I'll ask this once and once only. To all those anti-vaxxers out there - please show me your medical qualifications. From the sounds of it there are a lot of PhD scientists in this thread, willing to disagree with other highly qualified medical specialists.