Sanity still exists, it’s just not consistently applied.
For instance, consider marriage. It is generally agreed that it ought to be voluntary – that both parties should be mutually consenting. And not just to the initial union, either – but to the union on an ongoing basis. If at any point the union is no longer satisfactory, the couple’s right to part from one another is rarely questioned. This is sane. The idea that they should be forced at gunpoint to stay together is (rightly) regarded by most people asinsane.
Yet the same principle is rarely translated over to the realm of politics. We are told as children by our teachers about the “consent of the governed.” But when that consent is withdrawn, why is it that most people recoil from the idea of peaceful separation? Why do most people celebrate the forcible “union” of unwilling partners? How is it different to be told you must accept being lorded over by a certain form of government – or else – vs. being told you must stay with your husband or wife – or else? Is it a function of numbers? That is, because more than just two people are involved, it becomes ok to force some to be bound by others? Is it because of “process”? What makes that any different from a husband declaring he has a piece of paper in his hand that entitles him to “perpetual union” with his unwilling wife? Society, after all, is just intellectual shorthand for all the people in a given area. “Society” does not consent to anything because society does not exist. Only individual people exist – and do – or do not consent.