Can What is Impossible to Achieve be an Ideal for Us?

This Stack topper proposes a generalization of the age-old principle from Roman law, ultra posse nemo obligatur.

Excerpt:

This is an important topic because having the wrong ideals is worse than having no ideals at all.  Many think that to be idealistic is good.  But surely it is not good without qualification.  Think of National Socialist ideals, Communist ideals, DEI-driven ‘wokester’ ideals and of their youthful and earnest and sincere proponents.  Those are wrongheaded ideals, and some of them are wrongheaded because not realizable.  The classless society; the dictatorship of the proletariat; the racially pure society; the society in which everyone is made materially equal by the power of the state including the states’ agents of equalization.  Ideals like these cannot be achieved, and if the attempt is made terrible evils will be the upshot.  The Commies broke a lot of eggs in the 20th century (100 million by some estimates) but still didn't achieve their fabulous and impossible omelet. 

Their ideals were not realizable because not warranted by the actual facts of human nature. The possibility of their realization was merely imagined, merely ‘cooked up’ or excogitated in the febrile heads of such utopians as the Nowhere Man John Lennon.