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Le mieux est l’ennemi du bien. [The best is the enemy of the good.]
--- In La Bégueule (1772), Voltaire

Nirvana fallacy

Nirvana fallacy is the informal fallacy of comparing actual things with unrealistic, idealized alternatives. It’s closely related to the Perfect solution fallacy.

By creating a false dichotomy that presents one option which is obviously advantageous - while at the same time being completely unrealistic - a person using the nirvana fallacy can attack any opposing idea because it’s imperfect.

Perfect solution fallacy

The perfect solution fallacy is a fallacy that occurs when an argument assumes that a perfect solution exists or that a solution should be rejected because some part of the problem would still exist after it were implemented.

Examples

Fallacy: “Seat belts are a bad idea. People are still going to die in car crashes.”
Rebuttal: “Complete eradication of drunk driving is not the expected outcome. Goal is reduction.”

Fallacy: “Locks are a bad idea. People will still able to break through your door or with a lockpick, or a blowtorch or a sledgehammer.”
Rebuttal: “The locks isn’t to prevent all theft. It’s to deter some people and make thieves expend more time and money to break in, making their capture easier.”