ATVs are generally ridden in off-road areas, not public streets - out of sight, out of mind - while a person driving a car in most towns can see innumerable children riding bikes and e-bikes to school on a regular basis. It's partly a visibility issue.
It's fascinating to learn how many more kids die in ATV accidents every year than in e-bike accidents, then observing that there is a moral panic about kids riding e-bikes but not about kids riding ATVs.