I imagine this is just an unresolvable difference of opinion, but I don't believe in taking credit (any credit) for things I didn't actively take part in.

The sum contribution of your average American citizen to NASA's amazing success was to fulfil their legal obligation to pay tax. Congratulations, you didn't break the law :-P

My country has a fairly decent healthcare system, funded by taxes, including my own. It would be idiotic for me to somehow claim credit for this healthcare system, simply because I didn't actively take part in tax evasion. I can take a tiny bit credit for our ambulances though, because I actively and voluntarily donate my money to help keep them running, but even then any credit is minuscule to the point of not being worth mentioning (except to contrast the previous example).