The best I have is that they're helping society. But putting kids at risk for the safety of others is not something many families are tempted to do. Think about the FDA recommendation against fish for pregnant woman. So many people took it too seriously that the FDA now has a minimum recommendation for fish.
What's really interesting is that several of these families, in addition to avoiding the vaccine, take any step possible to bolster their immune systems, thus trying to further reduce the chance of fatal prognosis. It's a totally non-western approach to medicine, and probably a Steve Jobs-level poor decision, but these people are fully conscious of the decision they're making, and are arguably acting rational given that decision.
So you're right, people are acting stupid. But I can't get too mad about it because it's predictable. We need to find a solution instead of just calling them stupid.
Yes I'm old enough. I don't think that really matters for this argument.