[toadworrier]

> What is a reasonable mean?

Be reasonable! Just as even interpreted software must eventually appeal to hardware actions to give them meaning, laws must eventually appeal to human-judged concepts, including reasonabless.

A definition like the one above actually strikes a good balance. It leaves it up to courts faced with real situations to evolve rules about what constitutes "reasonable"; while giving those courts a definite thing to judge the reasonableness of.