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 Derivatives are fine. The problem is the government implicitly insuring the biggest gamblers from any major losses. 
 In bitcoin, a peer-to-peer electronic cash system, a derivative = not your keys, not your #bitcoin. 
 Sure. But derivatives serve different function (besides the degen trading). Hedging and insuring the risks is conceptually a fair efficiency gain.

Figuring out the most trustless way to do it is a separate issue.