I want to add to this. There are plenty of videos on military training in the US, and plenty of them have shown people making some sort of mistake. I've seen people not understand the difference between north and south, yet they were supposed to be the ones leading. I've seen people clump together in explosive training. Even with all these, that does not make the US military any less dangerous.Lack of trigger discipline don't mean lack of general discipline. It's as much part of being a professional solider as to know how to goose step.
No one had trigger discipline in WW2 and that don't mean the soldiers didn't have general discipline.
We should not be so angered by these mistakes, IMO. There will always be mistakes; we can just watch and hope they get ironed out with time. I have faith that they can minimize this with more training.