Falcone, take it easy.
In modern aviation today we relay on rules, procedures, CRM, discipline, proffesionalisam, knowledge and else.
"WRITTEN IN BLOOD", means based on tragic experiences of the past.
The "rules, procedures, CRM, discipline, professionalism, knowledge"
come from experience, also bad experience like accidents.
They were not given to us like the 10 Commandments by God the Almighty
curved in stone.
They change with every accident that happens, also in spite of them.
BTW: I hope by "proffesionalisam" you mean "professionalism"...
