That is it. When you become very aware of just how amazingly far away everything else is, fighting over a speak of dust and the only home we have seems absolutely ridiculous.

A great long form video on this is "Shouting at stars : A history of interstellar messages". It really highlights just how empty it all is. https://www.youtube.com/watch?v=uFI5WpK2sgg

Works up until the earth becomes uninhabitable in 600M years, before then humans are going to need to find and colonize a different planet.

Being hippie worked in the 1960ies, a crowd with a similar mindset fared much worse in 1930ies Paris.

My understanding is that ISS is not self-sustaining even in principle. It consistently needs to be resupplied with water and breathable air as the station continuously leaks it. These resupplies happen about once every month or two. This article goes into quite a few details about what would be needed for actual self-sustainable human space exploration and it looks like there's quite a few engineering challenges to work out.

https://www.frontiersin.org/journals/space-technologies/arti...