The nirvana fallacy is the informal fallacy of comparing actual things with unrealistic, idealized alternatives. It can also refer to the tendency to assume that there is a perfect solution to a particular problem. A closely related concept is the perfect solution fallacy.
By creating a false dichotomy that presents one option which is obviously advantageous—while at the same time being completely implausible—a person using the nirvana fallacy can attack any opposing idea because it is imperfect. The choice is not between real world solutions and utopia; it is, rather, a choice between one realistic possibility and another which is merely better.
The nirvana fallacy was given its name by economist Harold Demsetz in 1969, who said: ‘The view that now pervades much public policy economics implicitly presents the relevant choice as between an ideal norm and an existing ‘imperfect’ institutional arrangement. This nirvana approach differs considerably from a comparative institution approach in which the relevant choice is between alternative real institutional arrangements.’
A related quotation from Voltaire is: ‘Le mieux est l’ennemi du bien,’ often translated as: ‘The perfect is the enemy of the good,’ though it is better rendered as: ‘Leave well alone’ or ‘Leave well enough alone.’
The perfect solution fallacy is an informal fallacy that occurs when an argument assumes that a perfect solution exists and/or that a solution should be rejected because some part of the problem would still exist after it were implemented. This is a classic example of black and white thinking, in which a person fails to see the complex interplay between multiple component elements of a situation or problem, and as a result, reduces complex problems to a pair of binary extremes.
It is common for arguments which commit this fallacy to omit any specifics about exactly how, or how badly, a proposed solution is claimed to fall short of acceptability, expressing the rejection in vague terms only. Alternatively, it may be combined with the fallacy of misleading vividness, when a specific example of a solution’s failure is described in emotionally powerful detail but base rates are ignored (also known as the availability heuristic).
The Daily Omnivore 
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