But justice in the abstract is a dubious concept.
Lending to an investor to buy your shares is a deeply dubious concept, raising questions of legality and disclosure.
Progress is a dubious concept, and our rights and freedoms are daily corroded by the politics of greed, power and wealth.
Race is a biologically dubious concept and a notoriously slippery social reality, a matter of group identity and personal feelings, mutual misunderstandings and the dialectic of giving and taking offense.
To take one important example mentioned in the article, the "tax gap" is a dubious concept that requires a comparison of actual tax revenues with what HMRC calls the "amount of tax that should, in theory, be collected".
Nor should it be forgotten that the war lacked UN approval and helped usher in the dubious concept of "humanitarian intervention", under which military action can be taken on the flimsiest of pretexts.
John Carter was written at a time when people still believed that Martians might exist, while the character is transported to the red planet through the dubious concept of astral projection.
Something has changed, and it's not just that Barack Obama has replaced George W. Bush or, in France's case, that the film industry is doing O.K. It's a widening realization, I think, that globalism, beyond banking, climate change and warfare, has always been a dubious concept, a misleading catchall for how the world supposedly works, to which culture, in its increasing complexity, gives the lie.
But what the Valley and its venture capitalists should perhaps be doing is asking why they threw money - $35m £22.8mm) in all - at what was an ethically dubious concept with no clear business model.
It's simply not as big a deal as it's made out to be, especially in terms of the dubious concept of "accumulation" and "distribution" days, when stocks rise on higher volume or go down on higher volume, respectively.
