I did read another article where they interviews other traders about what he had said. While they disagreed with some of his other points they were in general agreement about that one.
Goldman Sachs is expected to report a loss at the next results, seems like ruling the world doesn't guarantee profits ;-)
It's true that day traders don't care if the market is going up or down, just like many specialists focusing on their domain doesn't care that much about the industry that employs them. Some people make money on volatility (day traders), but a lot of others make their money on trading on certainty (pension funds). Some people have a vested interest in seeing certain markets crash, e.g. if your industry struggles because of materials are getting expensive because of high demand from the building industry.