They do so by assuming the risk that hedgers want to shed. So, their role is considered favorable and essential for the smooth operation of the futures market (by providing liquidity to the market)....

They do so by assuming the risk that hedgers want to shed. So, their role is considered favorable and essential for the smooth operation of the futures market (by providing liquidity to the market). By contrast, others believe that such activities destabilize the market and make it more volatile than otherwise. Whatever the view, the verdict on speculation is still unresolved.