It is a valid point, but in the past, IANTD was heavily criticized in the Polish community for their cave instructing standards after the fatality in the Fontanazzi cave during a cave course. Regrettably, nothing changed, and those most vocal about it from among the IANTD instructors were expelled from the organization.
I wonder what, if any, contributory negligence could be assigned to the management of the Concordia mine. After all, they knowingly allowed Intro to Cave and Full Cave courses to be conducted on their site. I am assuming the knowledge of this being against any standard was known to them.