Karel_x
In our case the crew might be confused and did some wrong actions too.
If we are to believe the ACARS messages are genuine, it seem implausible that there was pilot error. One would expect continued transmissions but they ended abruptly. One would expect continued transmissions on the descent toward the ocean.
That could have been because of bad VHF reception but there were also no voice comms either. It just seems that the pilots must have been dealing with a serious situation that was affecting their comms and FCU/SEC. While there is always an element of mishandling in an emergency it doesn't seem likely that it was either the primary or substantial factor given the information that is so far available.
Of course it is possible that the Captain had left his seat and started randomly pulling breakers but the is not much to support this theory either.