Don't pull a TrashMan here, red.
Spaceflight has brought back technologies, and will continue to bring back technologies, that will benefit mankind over the long-haul. Having to live in the most austere of environments has and will continue to teach us methods of living better on Earth. Given the inevitable rise of populations, this is a paramount activity to pursue.
Furthermore, flight to the Moon has obvious advantages for future long-range spaceflight expeditions. Low gravity means we can assemble large assemblies on the Moon if infrastructure is created there, and using nuclear space propulsion will not be a concern in such an environment (although a good deal of the hype against futting something like that in orbit around Earth for assembly is crap). We need spaceflight. It's a long term, often low yield venture, but it always gives a yield - unlike a great chunk of your typical government expenditure...