I look at it (as Poobah said) like a mandate.
Exploration is part of who we are and has facinated men since the beginning of time. We are going to grouse and argue about it till we finally just go, have a look and settle it once and for all.
(Maybe it's just a "guy thing" Men love to explore.)
A liberal "progressive" myth.
Last time I saw it, the list of space tech "spinoffs" was around 5 single-spaced pages