The cause of this incident was the crew's incompetence in not checking or understanding their FMAs.
It doesn't matter if manipulation mistakes are made, they can be picked up in the FMA.
I know the FMAs are important, it was emphasized from day 1 in school. But apart from that it bears little relevance to this incident. If you go down the ILS with throttles wide open it's not time to sit and think about the FMAs. Get the pitch+power sorted first. Then when brain capacity catches up you can re-activate automatics and ensure the FMAs are correct.
As numerous people have already pointed out.