I suspect the issue is in part also just selfishness.
That 20 is in large part the kid that was brought into the hospital too late if at all. The kid that might have had astma or what have you.
The 3 is potentially yours or one in your family or friend group or community. It is a government mandated death and you might already distrust the gov.
A tragic event vs an authoritarian death inflicted upon you from that perspective.
My grandma is a scientist presumably very familiar with all this stuff but when her partner (not my grandpa) died from a bloodcloth shortly after getting an vaccine she also veered into that territory.