That's part of why they thrashed the whole chain of command.
To take the points you both make, let's say that range had been in sue for many years, configured exactly the same way, and what, tens of thousands of Marines had gone through the course, with exactly the same training standards and specifications, with nary ONE fatality..and now..all of a sudden, it's a command failure due to improper training and leadership? It may be, but we don't know..if we create a culture of zero-tolerance for training incidents..in which the price for such an event is your career, then it's gonna end up costing many more lives in combat..you train like you fight, you fight like you trained..