They are low cost.
They require very little thinking.
They outperform a large percentage of active managers.
The problem with index funds is that they can't help you avoid major market collapses like we had in 2008.
With the market hitting record highs after a massive five-year bull run one has to wonder if now might not be the time to seek out the value preservation of a good active "value" fund manager.
The video below is a lengthy conversation with the man who started the first index fund, John Bogle: