Opposite argument: what benefits would bring in terms of safety the existence of that big red "Cessna 172 law" button that would silence all the automation? How many accidents would such device had prevented so far.
Suddenly at the mere hiccup of an ECAM screen every Aibus/B777/whatever Captain would be extremely tempted to press it, for whatever reason, probably with a wider range of results, good or bad. Would any Captain want that much responsibility (by pressing said button) on his/her shoulders?