Would your faith in the process of law still be in place if your name appeared at the top of a list of people to be included in the next redundancy package, mono? It isn't actual threat we are talking about, it is implied threat, the same psychological effect that magnifies the threat of terrorism and thus makes it so effective.
As to your question about evidence spannersatx, read this human factors
presentation by Shell Aviation on the Royal Aeronautical Society's Human Factors Group website - especially the second and third slides. Follow up with your own searches on maintenance related aircraft accidents and hull losses and you will soon answer your own question. The commercial accident rate declined steadily until around 1978/79 when it levelled off. Although CFIT remains at the top, causes other than maintenance errors continue to decline, the overall level being kept constant by increased maintenance errors.
I do admit the possibility that this may be due to improved methods in accident investigation, where some incidents that would previously have been assigned as pilot error, are now identified as being due to maintenance errors. Discuss.
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Through difficulties to the cinema