Because they let investors Do Something about global market uncertainty and volatility caused by events like the recent Brexit, Oil prices crashing, and the 07/08 financial crisis.
Because they can offer positive performance in bear markets, be a hedge against inflation, provide tactical commodity exposure, and offer tremendous liquidity and transparency.
"Trillions of dollars have been wiped from global equity values since Britons voted to secede from the EU, raising concern that an already-fragile global economic recovery will falter.
Managed futures funds have stood out, benefiting as the so-called Brexit magnified existing market trends, including the decline of the pound and the rally in safe-haven assets from bonds and gold to the Japanese yen."
-Bloomberg “In Brexit Rout, Managed Futures Funds Emerge as Big Winners” 6/27/16
(Disclaimer: Past performance is not necessarily indicative of future results)