First of all, if you don't view freeloading as deplorable or irresponsible, that's fine but I do. And like I said, it's a rational choice for parents, let someone else's kids take the risk and bask in the free benefits, but society doesn't have to allow a rational choice for Person A to put at risk the other 300 million + of us which is why we have vaccine mandates.
And they put everyone at risk who is too young for vaccines, the very sick and/or immunosuppressed people who can't take vaccines, those for whom vaccines didn't work (and that they don't know didn't work until they're infected), the very old, and those for whom the vaccine may have lost effectiveness. All of them are put at risk by anti-vaxxers. In a fully vaccinated population, those incredibly vulnerable people are offered immense protection by herd immunity, which you call a side effect but in fact is the POINT and the REASON all 50 states have some requirement for kids to be vaccinated, especially if they're going to attend public schools.
So, yes, they are absolutely putting others at risk. Thanks goodness for all of us their numbers are small. Instead, responsible parents and others who get vaccines have reduced measles from maybe 4 million cases per year to near zero, and the outbreaks in little pockets mostly STAY in those pockets. That does not happen without herd immunity and high vaccination rates. If the rest of us listened to their pseudo-science BS we'd be right back where we were before vaccines were invented. But because the VAST majority still get vaccines, those morons can decline to have their kids vaccinated and very, very likely nothing bad will happen to their children THANKS to the rest of the country who DID.
I'm assuming that's a typo. If those aren't the point, what is the point?
Of course most people being inoculated IS.....herd immunity! In 2019 We don't "need" the vaccines because of...herd immunity!
And unvaccinated kids ARE a threat to the medically vulnerable. If they want to stay home and don't work in hospitals, go to hospitals, or clinics or nursing homes or buses or trains or planes, or anywhere else the very young, very old, immunosuppressed, etc. are found, that's fine. Unfortunately, we can't keep them in their houses so the next best step are vaccination mandates, with few exceptions.