Have you seen children? Empathy is one of the last things to develop. There is a specific purity of cruelty attributed to children for a reason.
Civilization is conditioned into humans as a general rule, not the other way around, and needs consistent reinforcement. Humans are eusocial, but like chimpanzees and ants where war with other “tribes” is closer to a baseline than cooperation.
And there you go from the moral/intellectual high ground, mocking them as toddlers and saying it’s right and normal to laugh and make fun of them.
I can’t stand vaccine hesitancy and anti-science bullshit. I’ve had to deal with this becoming a Fox News thing in my own family, and lost too many people from alternative “Eastern” medicine over “Western” medical science. But the mockery and ridicule only feeds into the Christian persecution complex most of that rural white population already embraces, and causes the wagons to circle.