[throwawaytoday5]

Parents routinely choose selfish outcomes at the detriment to their children and society.

Not vaccinating your children not only affects your immediately family, but everyone's children around you. That is the most obvious example, others include indoctrinating children in religion is another.

[tonyedgecombe]

Not vaccinating your children isn't selfish, it's the opposite because they are at greater risk of contracting disease.