Why? Because it's frickin' cool. That's why.
I know that I've referenced here some folks (cough, INLAWS, cough) who have voiced their opinions that "The only thing the space program ever brought me was Tang, and I don't even like Tang!"
You know, I'm not even going to get into the fact that they watch satellite TV, use cell phones, expect the weather forecast to be perfect, and are jingoistic in their foreign policy take. Not to mention their reliance on modern medicines.
All I'm going to say is: without a space progam, you don't get incredible images like this one:
View of a total solar eclipse (occlusion) from the International Space Station, 29 MAR 2006. (click to enlarge)And, for what it's worth: I liked Tang. I think I'm gonna go buy some right now.