Bogle said in an interview that I cannot find but i's probably on YouTube that he saw nothing wrong with ETFs as an investment product, simply that they encoura

Bogle said in an interview that I cannot find but i's probably on YouTube that he saw nothing wrong with ETFs as an investment product, simply that they encouraged non-passive behavior for most investors, and he thought temptation to time the market or liquidate/buy at the wrong time were tremendous stumbling blocks or get hoodwinked by grandiose promises of some arcane sector, and ETFs made that easier to give in to. (I'm paraphrasing.)