I would tend to agree, although the Hindenburg omen might easily be explained by publicity like this submission on HN. Investors read about the Hindenburg omen and the fact that it has occurred twice this month. They assume that a crash is imminent, so they start selling stocks, which causes the market to collapse.

In this way what is drivel could be made reality because too many people don't believe it to be drivel. There are some really interesting analysis of stock market dynamics such as this in the book "The Wisdom of Crowds" by James Surowiecki