Subjectivity: Who is to say what's right?

This is probably too snarky, but bear with me: If I fill my fuel tank with non-fuel or the wrong fuel, it will damage my car and fail to perform. Is that because fueling the car is a bad idea? If fueling a car is a good idea, shouldn't there be a million ways to do it so that it's easy for people? This "petrol only" rule = is too restrictive to be useful in the real world. Every time I put diesel…