My point is that if I know a bit about a subject, I don't fall into the trap of believing that I can point to "an obvious mistake" which was signed off by multi

My point is that if I know a bit about a subject, I don't fall into the trap of believing that I can point to "an obvious mistake" which was signed off by multiple professional people working in that area, especially in an area like civil engineering where you have criminal liability for "an obvious mistake". Sure, I would never cross that bridge if I saw those fake stayed cables damaged after a storm, because again, I am in no position to judge the design of the bridge, but it is obviously damaged and I must assume that it is unsafe. Maybe a structural engineer would immediately spot that those stayed cables are fake and wouldn't worry about cross it. But if the bridge looks intact, I would just assume that the engineers knew what they were doing.