Questioning value is one thing. Specifically, demeaning people in the space is another. Paul Krugman is even tweeting about "cryptofreude."
When was the last time you complained about the carbon footprint of your American Express card? How many miles per gallon does that aircraft carrier get that backs up your dollars? (Hint: The answer is actually many many gallons per mile.) How many children were heinously burned from white phosphorus munitions or developed cancer from depleted uranium so that you can sleep soundly in your 500 thread count sheets?
Bitcoin is version one. Subsequent versions are already more efficient and will likely be exponentially more so. Finally, the computers don't care where the electricity comes from. Rather than letting greed from the Trumps and Tillersons of the world continue to subsidize the fuels of the last century, we could use block chain as a catalyst to usher in a new era of renewables, for which the technology largely already exists.
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