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It is an American space mission. Nevermind how you seem to paint the idea of cheering after a successful mission to be "sickeningly patriotic", but why do you expect them to congratulate other countries ahead of themselves when they go to the press to announce the success so far (and they did credit other countries anyway, as R1600 pointed out) amidst constant calls for defunding and privatizing? Not only am I pretty sure that the people who work at NASA would like to continue to work at NASA, but outside of your increasingly unhinged-from-reality conspiracy theories I'm not seeing how NASA patting themselves on the back invalidates the ability for it to benefit everyone.
I again (and maybe you'll acknowledge it this time) point towards the 1960s. Remember how NASA had a practically unlimited budget (in comparison to today), the country was captivated with the concept of space travel (rather than only caring so long as it doesn't cost them anything), and the entire thing was arguably started to be a huge propaganda tool to use against the Soviet Union (hence, Space Race)? I'm pretty sure the things we learned and the advancements we made during that era of space travel directly benefited the human race as a whole. So how, exactly, do you justify this nonsense about how the human race can't benefit from this comparatively low-key (from a political perspective) mission unless China decides that they want to get into a shooting match over it?