Reality Check: Nobody Knows Anything

WHENEVER one writes about the failure of active managers to beat the index, someone is bound to pop up online and argue that people don't pick fund managers at random. Select the right fund managers and all will be well. But how? Relying on past performance does not seem to work. Logic would also suggest that it cannot be easy to identify the best performers in advance; if it were, then why would anyone give money to the underperformers?