Earlier quoted context omitted.
This is insane. By this logic, public goods don't exist. Tax-funded fire departments are great if your house catches fire, not so great if it doesn't, etc.
Indeed. I have no children, why should I pay taxes to educate other people's kids? Just because they're our future laborers working on and within our common economy to keep things going after I've left the workforce.
Seriously, though, why are real estate prices higher in areas with better schools? It's not because every person who lives there or might live there has kids, it's because better public infrastructure creates better quality of life for everyone. Good public schools might not impact you directly if you don't have children, but they do attract better neighbors, create more cultural and social opportunities (even for the childless), and generally produce better quality of life for the communities they serve.
I really, really wish all the libertarians would get off HN and move to Somalia or some other place with no functioning government where they could finally be happy. I'm sure it would work out well for them, because good governance clearly has no positive externalities.