Those are nominal - not adjusted for inflation. Second, your assuming your options were the stock market or a coffee can. So assuming you invested in T-bills your maybe 6 - thats best case, of the best example.
You also conveniently ignored from 66-92 - flat. While CD's and money markets were paying 10+% during much of that. So vis-a-vis huge loss.
So, post war there were 30 years that were pretty bad (compared to risk free returns and inflation) and the last 30 years were very good. The 30 years before that were also pretty bad. There are additional off shore examples. Nikkei has never come back in real terms. 40 years.
Its easy to make things good if you pick the proper end points. Unfortunately you can't pick your lifetime end points, and you never know the start and end ahead of time - hindsight only.
I really don't care how others invest. Like I said, I am fully in equities, I just dislike the propaganda that doesn't match reality.