I don't disagree with you, but I'm going to take it a step further and say selfishness is the root cause. It's not that people are too stupid to understand, it's that they are too selfish to care to learn. You could call that a form of stupidity, but there are plenty of intelligent, educated people who fully understand the validity of the threat and still don't give a fuck because they don't think it personally affects them.
Humans have such shitty shitty memories. Unless something happened last week it's basically unknowable.... Nazi? Never heard of it. Preventable diseases? Fuck if I know.
Unless it's hurting them RIGHT NOW it basically never happened for most morons.
Globally and in the US, vaccination rates against measles—via the measles, mumps, and rubella vaccine (MMR)—have fallen in recent years due to pandemic-related health care disruption and vaccine hesitancy fueled by misinformation.
It's beyond sad, but the only way out seems to be natural selection of vaccinated people at this point. There's literally no cure for (children of) antivaxxers who won't listen to experts.
Unfortunately it’s not only kids of anti vax people who will be susceptible to these diseases. Some kids are not vaccinated because of medical reasons and for some kids the vaccination didn’t make them immune. Plus kids who haven’t gotten their jabs yet, because they are too young, will be put at great risk because herd immunity is failing.