Every time the root cause was the same : insufficient training
I agree 100%.
I think it is safe to say with 9 weeks of training no one can safely navigate a ship.
Boot camp is nine weeks. All sailors receive much more training after boot camp. It's called A school and C school. These schools give the newbys training in their selected training.
The lack of training on the ships you mentioned was a command issue. I honestly do not think it is a navy wide situation. Those ships chain of commands FAILED to keep those shipmates trained in their ratings and they lacked discipline in certain areas. Fortunately they were trained properly in Damage Control.