I also believe that the stock market is a game, not an investment vehicle. The nature of the market has transformed every since the day trader, quants and HFT have entered the markets. As long as you understand this, then putting money in the markets is fine. If you don't want to be a part of the game, then regular people should buy bonds (not bond funds, but actual bonds that pay interest).
My opinion is that Wall Street has shifted focus since the 80s to trying to convince people to dump their money, all their money, into mutual funds. Then these massive fund managers take their 1-3% in various fees and just move money back and forth. I don't trust Vanguard any more than I trust any of these other large mutual fund companies, and I happen to know a lot of people that work at various asset management companies in the Bay Area. They print money without ever beating the SP500, instead they try to change the equation by claiming they beat the SP500 on a risk-weighted basis, etc. The entire thing is a sham, and as the OP remarked, why do the mutual fund managers have yachts but none of the clients do? It's because they make their money from the hundreds of billions of dollars they skim off the top of their customer funds.