The whole problem with the vaccine scare is that some parents believe the FUD and make the actually rational decision that they'd rather have their kids get measles and live, than get autism and be damaged for life.
These parents do what they think is best for THEIR children.
But the cost for doing this is that OTHER children that rely on herd immunity will start dying of measles.
So by having every parent do a local "optimization", the net result, an unvaccinated world, is much, much worse. And then to add insult to injury, it's just plain wrong that vaccines cause autism, so the parents that believe this are only making the world a worse place for everyone and not really doing what's best for their children in any way.
These parents do what they think is best for THEIR children.
But the cost for doing this is that OTHER children that rely on herd immunity will start dying of measles.
So by having every parent do a local "optimization", the net result, an unvaccinated world, is much, much worse. And then to add insult to injury, it's just plain wrong that vaccines cause autism, so the parents that believe this are only making the world a worse place for everyone and not really doing what's best for their children in any way.