you are right
I know of a couple of guys who failed the selection for training dept and are now big mouth as far as the " inexperience " of some of the trainers.
However some of the incidents and events we've had you cannot fix with a quick sim session, there are fundamentally a few things a wide body pilot , if he didn't waste his time taking selfies and asked the questions and learnt from the guy his flying with , should know , in fact any pilot who takes his job seriously as a professional. Everyone , including trainers make mistakes, but to put the blame purely on the dept is plain silly.