I've just fully encapsulated your arguments into 10 second clips. No need to get depressed. Maybe eventually you can have an idea that isn't so reducible. 
I don't think you've encapsulated my arguments so much as tried to reduce the moral question to a caricature you can use to rationalize your arguments as having addressed what I previously qualified as X.
Alternatively, part of me thinks a rebuttal to everything you've said can be captured by "Whitey on the Moon", but I'll do you the courtesy of formalizing my thoughts.

So:
Perhaps you just didn't understand my point, or maybe you can't see how weak your arguments are from an investor standpoint. (Except for the asteroid detection.)
As someone who's done grant writing for living, I can tell you that trying to procure government funds by making promises about beneficial side effects rather than addressing the benefits of the actual project is very unlikely to be successful.
How do you even measure the benefits, or try to produce a reliable strategy for return on investment?
So far your argument seems to hinge on past technologies born of the space program that turned out to be helpful to society at large, though a lot of that seems incidental to the original purpose.
After a point that's just luck then right, and if your argument relies so much side effects then it seems to me you are already agreeing research into space exploration is largely worthless to the public at large if those benefits don't manifest.
As for the idea the Tyson's Star Trek wish fulfillment fantasy justifies the expenditure because it is interdisciplinary, I think green technologies can also bring in multiple disciplines but also benefit far more people in a more immediate fashion.
Heck, I was reading about the innovations in computer science that game production brought about. I'm guessing using NASA's budget to fund some education program relating to game development would inspire far more kids at the apparently critical early age in a far more reliable manner than pictures of rockets and planets.
Or just use the money for research in terrestrial fields. But space monies seems like one of the lowest ranking options compared to so many other things.