Haven't read this entire thread, so forgive my possibly naive comment.
Airbus are built in a part of the world which is very regulated, and many of it's governments are centre left... So if a person on the production line, or in the engineering dept etc. sees a possible fault, or a short cut too far to increase profits over safety, they would have no problem with raising this issue up the chain of command.
If a similarly minded person raised a concern elsewhere around the globe, they may not dare raise a reasonable concern for fear or being demoted, sacked etc.
The company I work for has a totally open culture to reporting absolutely anything that might compromise safety.