SE: Why did Stanley Kubrick include these scenes in 2001: A Space Odyssey?

I can't recommend these two YouTube channels enough:

* Every Frame a Painting [0]

* Nerdwriter1 [1]

They've really increased my appreciation for film and film-making overall. I feel like my movie-watching has changed significantly too. Movies that previously seemed boring now have handles into which I can relate and feel. Really good stuff.

[0] https://www.youtube.com/channel/UCjFqcJQXGZ6T6sxyFB-5i6A

[1] https://www.youtube.com/channel/UCJkMlOu7faDgqh4PfzbpLdg

Pardon my being naive, but I find it amazing how exchanges on StackExchange are always so high-level and civil. I know very little about StackExchange itself, how have they achieved that kind of quality?

As a follow-up question, why are all communities not doing the same?