Because there are real world counter-examples take Japan and stock performance there.
It has worked to this point, but past returns are not guarantee of future returns. On other hand well both political parties really enjoy line going up, so even if it leads to inevitable destruction lot will be done to keep it going up.
your comment reminds me of when i interned at a large cloud services provider
i was very much infatuated by the idea of total reliability on a global scale and couldn't wait to talk about the CAP theorem with anyone who would listen. Read much of the research. I still love to flip through Designing Data-Intensive Applications by Martin Kleppmann occasionally.
As I was learning about said company's server racks there was a component that I asked an engineer on my team about – "Isn't that a single point of failure?"
He looked at me, exhausted and stressed out, and just said "Take it far enough, the Earth is a single point of failure."
It has worked to this point, but past returns are not guarantee of future returns. On other hand well both political parties really enjoy line going up, so even if it leads to inevitable destruction lot will be done to keep it going up.