I never said it wasn't open to abuse and manipulation. But yes, the price of oil is the price of oil. Today it's half what it was a year ago, that's what the market says, so that's what you pay (spot). Markets are always open to manipulation and corruption, and market failures are rife when there's an imbalance between the information available to each party, buyer and seller, it doesn't take speculators to achieve that outcome.
Indeed, in principle there's no need for speculators in a market, but the IDEA is that the increased liquidity makes matching bids to offers trivial, and the theory goes they help achieve some information neutrality.
Pretty much any activity we engage in is a bet; everything we do in life has associated risk and reward. That pretty much sums up life in a way. Information is essential to risk assessment, next years rainfall in Iowa isn't information, it's a guess, especially nowadays(!), however the price of oil in 2020, whether it's going to be higher or lower than today, is somewhat more subject to analysis, right? Well, at least we do like to pretend we know what we're writing about here!

Anyway, the point about the market failures, speculation certainly does make things worse. No argument there, but the market failure itself isn't due to speculation per se, but rather the fact that a number of market participants think they know something others do not and bid/sell accordingly (sentiments, predictions of the future). Speculative trend chasing magnifies the imbalance and can cause all sorts of problems. No system's perfect, right?

I agree that the MBS bubble, and subsequent bursting was certainly an excellent example, amongst many. But was the initial run-up in the price of oil a market failure, a bubble? Was the subsequent fall, rise and fall signs of market failures?