@mekkaokereke @davidnjoku I guess one more thing to note is that NASA is both a not-for-profit organization and (still) a civilian space agency. Although it deals in space and is therefore subject to defense regulations, it is not a defense agency or related to military aims, nor can it gain economically from going to space. That means NASA cannot go into space for anything other than peaceful or scientific reasons--unlike thousands of launches per year you never hear about that put up defense related technologies or private communications satellites.
NASA's goals include doing science, expanding space capabilities, and stimulating the American scientific and technical workforce and the US economy through outreach and contracting. Eve contractors don't make much money with NASA partnerships as they usually built one-offs, but see it as a pro-bono opportunity to push the boundaries and limits, think outside the profit-driven model, and have other metrics for success than return-on-investment.
All national space agencies also construct the political orientation of the nation through their scientific and technical goals and means, of course, and NASA is no exception. Going back to the original writings of James Webb as administrator in the 1960's, the challenge of doing civilian spaceflight in the USA is that a centralized authoritarian structure (he was thinking of the USSR at the time) would be more efficient, but less democratic. The challenge at NASA was to build capacity in a decentralized way that stimulated a national economy at the same time. That made "space age management" a challenge with political import, not just a question of getting into space (and back).
Much of this is at threat with the cuts to science at the agency and the massive reorientation toward "new space" entrants that allow for venture investment. The "space economy" is actually on earth - not in space - because of what they hope to stimulate through ROI.
So when they say "for all humanity" they are speaking to this core tension. Must be for science, for a greater mission, not military, not merely industrial, but for inspiration, while accepting that the reality is a complex set of tensions in which they must achieve the impossible