A “Values-Based Approach“? The question is — what are the values? I think he’s got it wrong:

Discovery is why a nation should go to space. It is what inspires all of humanity. It has been NASA’s only use of human spaceflight in the post-Apollo era that has returned value that is highly regarded by nearly all people in developed countries with free access to information. The synergy that once existed between human-assisted and robotic space exploration in the Hubble Space Telescope (HST) program is a blueprint for sustained deep space human-assisted exploration that can stoke the nation’s competitiveness in science, technology, and math toward realization of long-term financial and physical security.

That’s an opinion, not a fact. I would expect a scientist to think that science is the reason for human spaceflight, but most people don’t agree with him (or have even given it much thought). If it’s not for the purpose of developing and settling space, the amount of money we’re spending on it is unjustifiable.