Note that derivatives like futures add additional layers of emotion over the cash market.
In the cash market, prices are generally set to match supply and demand of the actual physical thing. Supply is what it is, and demand can go crazy in mysterious ways.
In a derivatives market, prices reflect the supply and demand of promises and expectations of the physical thing. You're buying and selling a completely abstract entity only loosely coupled to the physical thing. Here both supply and demand are driven by all sorts of mysterious whims.
Not to mention that derivatives markets tend to be designed for speculation.