When you omit the humans, you omit the humanity of spaceflight. Neil deGrasse Tyson sums it up best:
Tyson, an astrophysicist and director of New York City's Hayden Planetarium,
agreed with his interviewer in saying that "the manned program is a force
of nature on the educational pipeline of America. It is the force that excites
people to want to become scientists in the first place." [1]
Plus: http://www.youtube.com/watch?v=Hi636wl6a1w[1] http://www.space.com/8184-robots-humans-space-colbert-tyson-...