I'd love to hear a good argument for optimism if you've got one. I suppose the pendulum thing works sometimes on certain timescales, but for a physical analogy "shit rolling downhill" might be more accurate. Typically doesn't roll back up and momentum builds. Just as "rich get richer" and inequality accelerates, so "bullshit makes bullshit" and things begin to spiral if truth / earnest effort is not even neutral, but now arguably a disadvantage as mentioned in TFA. Small course-corrections seem pretty rare in history or in nature without revolutions or catastrophe