The system should treat all user input as sacred.
A computer shall not waste your time or require you to do more work than is strictly necessary.
Right now, computers, which are supposed to be our servant, are oppressing us.
What users want is convenience and results.
Imagine if every Thursday your shoes exploded if you tied them the usual way. This happens to us all the time with computers, and nobody thinks of complaining.
An interface is humane if it is responsive to human needs and considerate of human frailties.