The problem is herd immunity.
If those people are within our "herd" and one of their kids gets infected with ebola-marburg-plague-mumps-pox, then they become a disease transmission vector to the rest of the herd.
And in that case, everyone who comes in contact with them becomes exposed to it and those who have not yet been immunized against ebola-marburg-plague-mumps-pox, run the risk of getting infected.
Now, if that was polio, you get crippled and paralyzed.
Agree 100 percent azav. I'm going to launce int a rant here soon, I just want yo to know it isn't directed at you.
Let's add whooping cough to that mix. About the time of McCartyism 2's height, I contracted Whooping cough as an adult. I have no proof of course, but I suspect that it was a herd immunity issue. Back when we were not batshit crazy and stupid, and relied on scientist for our science and not people who are famous for taking their clothes off and nothing else, we didn't need recurring pertussis vaccines. Now we do because foolish and stupid assholes listen to McCarthyism 2.
Folks, you do not want your child to contract whooping cough under any circumstances. The initial "cold" stage comes and goes pretty quickly, but the coughing fits - a little longer. Oh, and the fun begins.....
The couhh starts oddly enough at the bottom of a breathing cycle. You try to catch a breath, but it's a weird whooping sort of spasm. As you struggle to breathe, the world starts to go brown, red and squiggly. Several times I thought I bought the farm. fortunately, about the time I was blacking out, the spasms relaxed. Not all are as "lucky".
But allow McCarthyism to give you your marching orders, anti vaxxers, You'll be just as responsible as she is if your child dies from an easily preventable illness. In a world where Jenny McCarthy is respected and admired, and where researchers and scientists are reviled, you'll eventually reap the rewards of your stupidity.