Regarding 2 and 3, it feels like a major factor here is the huge number of people who have forgotten (or never knew) that vaccines as a category aren't automati

Regarding 2 and 3, it feels like a major factor here is the huge number of people who have forgotten (or never knew) that vaccines as a category aren't automatically 100% effective, because all the hard work to wipe out diseases like measles from the general population has already been done.