Giving the crew the ability to UNLOCK in an emergency and outside of the normal envelope is, surely, different from giving them the ability to UNLOCK by mistake and / or inadvertently.
Of course I know nothing about what happened in this case, but - "there's nowt so queer as folk" ( Yorkshire saying) and I know of an aircraft accident where the crew selected reverse thrust in the air on short finals, secure in the knowledge that the engines wouldn't go into reverse until the undercarriage 'squat' switch was activated when the wheels touched the ground. Guess what happened ? Many died.
There's nowt so queer as folk, and anything operated by humans is subject to human error, whereas with automatic /computer systems nothing can go wrong, go wrong, go wrong.
At this stage it doesn't really matter what went wrong, so long as those who need to know eventually find out.